SECURITY AGREEMENT

EXHIBIT 10.4

EXECUTION COPY

SECURITY AGREEMENT

This SECURITY AGREEMENT (as amended, supplemented, amended and restated or otherwise modified from time to time, this “Security Agreement”), is entered into as of January 10, 2003, by FIBERNET TELECOM GROUP, INC., a Delaware corporation (the “Grantor”), in favor of DEUTSCHE BANK AG NEW YORK BRANCH, as Issuing Bank (the “Grantee”).

R E C I T A L S

A. Pursuant to the Amended and Restated Credit Agreement, dated as of February 9, 2001 (as amended, supplemented, amended and restated or otherwise modified from time to time, the “Credit Agreement”), among Devnet L.L.C., a Delaware limited liability company (“Devnet”), FiberNet Operations, Inc., a Delaware corporation (“FiberNet” and, together with Devnet, the “Borrowers”), the financial institutions from time to time parties thereto as lenders (each individually referred to herein as a “Lender” and, collectively, as the “Lenders”), Deutsche Bank AG New York Branch, as administrative agent for the Lenders (in such capacity, the “Administrative Agent”), TD Securities (USA) Inc., as syndication agent for the Lenders (in such capacity, the “Syndication Agent”) and Wachovia Investors, Inc., as documentation agent for the Lenders (in such capacity, the “Documentation Agent”), the Grantee has extended commitments to make Loans or issue Letters of Credit to, and for the benefit of, the Borrowers;

B. It is a condition precedent to the effectiveness of the Ninth Amendment to the Credit Agreement, dated as of January 10, 2003 (the “Ninth Amendment”), among the Borrowers, the Lenders, the Administrative Agent, the Syndication Agent and the Documentation Agent, that the Grantor execute this Security Agreement and the Securities Account Control Agreement, dated as of the date hereof (as amended, supplemented, amended and restated or otherwise modified from time to time, the “Securities Account Control Agreement”), among the Grantor, the Grantee and Deutsche Bank Trust Company Americas;

C. The Grantor has duly authorized the execution, delivery and performance of this Security Agreement; and

D. It is in the best interests of the Grantor to execute this Security Agreement as the Grantor will derive substantial direct and indirect benefits from the Loans made to the Borrowers, and the Letters of Credit issued for the benefit of the Borrowers, by the Grantee pursuant to the Ninth Amendment and the Credit Agreement.

AGREEMENT

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and in order to induce the Grantee to make Loans and issue Letters of Credit to or for the benefit of the Borrowers pursuant to Credit Agreement (as amended by the Ninth Amendment), the Grantor agrees, for the benefit of the Grantee, as follows:

ARTICLE I.

DEFINITIONS

Section 1.1 Defined Terms.

The following terms when used in this Security Agreement shall have the following meanings:

“Administrative Agent” shall have the meaning set forth in the first recital.

“Borrowers” shall have the meaning set forth in the first recital.

“Collateral” shall have the meaning set forth in Section 2.1.

“Collateral Release Date” shall have the meaning set forth in Section 4.1.

“Credit Agreement” shall have the meaning set forth in the first recital.

“Devnet” shall have the meaning set forth in the first recital.

“FiberNet” shall have the meaning set forth in the first recital.

“Grantor” shall have the meaning set forth in the preamble.

“Issuing Bank” shall mean Deutsche Bank AG New York Branch, as issuer of any Letter of Credit under the Credit Agreement.

“Lender” or “Lenders” shall have the meanings set forth in the first recital.

“Ninth Amendment” shall have the meaning set forth in the first recital.

“Security Agreement” shall have the meaning set forth in the preamble.

“Securities Account Control Agreement” shall have the meaning set forth in the first recital.

Section 1.2 Credit Agreement Definitions; Principles of Interpretation.

Unless otherwise defined herein or unless the context otherwise requires, terms used in this Security Agreement, including its preamble and recitals, have the meanings provided in the Credit Agreement (including the principles of interpretation set forth in Section 1.3 of the Credit Agreement). All references herein to the security interest granted to, assignment or pledge to or other rights or interests granted hereby to the Grantee shall be deemed to be rights or interests granted to the Grantee solely for its own benefit and not in its capacity as Administrative Agent under the Credit Agreement.

Section 1.3 UCC Definitions.

Unless otherwise defined herein or in the Credit Agreement or unless the context otherwise requires, terms for which meanings are provided in the UCC are used in this Security Agreement, including its preamble and recitals, with such meanings.

ARTICLE II.

SECURITY INTEREST

Section 2.1 Creation of Security Interest.

As security for the due and punctual payment in full in cash and performance in full of the Letter of Credit Obligations owing to the Grantee, the Grantor hereby assigns and pledges to the Grantee, and grants to the Grantee a security interest in and lien on, all of the Grantor’s right, title and interest in and to the Securities Accounts (as defined in the Securities Account Control Agreement) and all cash, securities, investment property or other assets now or hereafter credited to such Securities Accounts and all proceeds (as defined in the UCC) thereof (collectively, the “Collateral”).

Section 2.2 Financing Statements.

The Grantor shall execute all financing statements, continuation statements, assignments, certificates, and other documents and instruments with respect to the Collateral pursuant to the UCC and otherwise as may be necessary or reasonably requested by the Grantee to perfect or from time to time to publish notice of, or continue or renew the security interests granted hereby (including, such financing statements, continuation statements, certificates, and other documents as may be necessary or reasonably requested to perfect a security interest in any additional property or rights hereafter acquired by the Grantor or in any replacements, products or proceeds thereof), in each case in form and substance satisfactory to the Grantee. The Grantor will pay the cost of filing the same in all public offices where filing is necessary or reasonably requested by the Grantee and will pay any and all recording, transfer or filing taxes that may be due in connection with any such filing. The Grantor grants the Grantee the right, at any time and at the Grantee’s option, and at the Grantor’s expense, to file any or all such financing statements, continuation statements, and other documents pursuant to the UCC and otherwise as the Grantee reasonably may deem necessary or desirable.

Section 2.3 Injury to Collateral.

No injury to, or loss or destruction of, the Collateral or any part thereof shall relieve the Grantor of any of the Obligations.

Section 2.4 Continuing Security Interest; Transfer of Notes.

This Security Agreement shall create a continuing security interest in the Collateral and shall

(a) remain in full force and effect until payment in full in cash of all Letter of Credit Obligations and the corresponding termination of all Revolving Loan Commitments applicable thereto,

(b) be binding upon the Grantor, its successors, transferees and assigns, and

Without limiting the generality of the foregoing clause (c), the Grantee may assign or otherwise transfer (in whole or in part) any Note or Commitment held by it as well as any interest in any other Letter of Credit Obligations to any other Person or entity as permitted by, and in accordance with the terms of the Credit Agreement, and such other Person or entity shall thereupon become vested with all the rights and benefits in respect thereof granted to the Grantee under any Loan Document (including this Security Agreement) or otherwise, subject, however, to any contrary provisions in such assignment or transfer, and to the provisions of Sections 9.1 and 9.16 of the Credit Agreement.

Section 2.5 Grantor Remains Liable.

Anything herein to the contrary notwithstanding:

(a) the Grantor shall remain liable under the contracts and agreements included in the Collateral to the extent set forth therein, and shall perform all of its duties and obligations under such contracts and agreements to the same extent as if this Security Agreement had not been executed,

(b) the exercise by the Grantee of any of its rights hereunder shall not release the Grantor from any of its duties or obligations under any such contracts or agreements included in the Collateral, and

(c) the Grantee shall not have any obligation or liability under any such contracts or agreements included in the Collateral by reason of this Security Agreement, nor shall the Grantee be obligated to perform any of the obligations or duties of the Grantor thereunder or to take any action to collect or enforce any claim for payment assigned hereunder.

Section 2.6 Security Interest Absolute.

All rights of the Grantee and the security interests granted to the Grantee hereunder, and all obligations of the Grantor hereunder, shall be absolute and unconditional irrespective of:

(a) any lack of validity, legality or enforceability of the Credit Agreement, any Note, or any other Loan Document;

(b) the failure of the Grantee

(i) to assert any claim or demand or to enforce any right or remedy against any Borrower, any other member of the Borrower Group or any other Person (including any other grantor) under the provisions of the Credit Agreement, any Note, any other Loan Document, any Interest Rate Agreement or otherwise, or

(ii) to exercise any right or remedy against any other grantor of, or collateral securing, any of the Obligations;

(c) any change in the time, manner or place of payment of, or in any other term of, all or any of the Obligations, or any other extension or renewal of any Obligation of any Borrower or any other member of the Borrower Group;

(d) any reduction, limitation, impairment or termination of any of the Obligations for any reason other than the written agreement of the Secured Parties to terminate the Obligations in full, including any claim of waiver, release, surrender, alteration or compromise, and shall not be subject to, and the Grantor hereby waives any right to or claim of, any defense or setoff, counterclaim, recoupment or termination whatsoever by reason of the invalidity, illegality, nongenuineness, irregularity, compromise, unenforceability of, or any other event or occurrence affecting, any Obligations of any Borrower, any other member of the Borrower Group or otherwise;

(e) any amendment to, rescission, waiver, or other modification of, or any consent to departure from, any of the terms of the Credit Agreement, any Note, any other Loan Document or any Interest Rate Agreement;

(f) any addition, exchange, release, surrender or non-perfection of any collateral, or any amendment to or waiver or release or addition of, or consent to departure from, any other security interest held by any Secured Party or any holder of any Note securing any of the Obligations; or

(g) any other circumstance which might otherwise constitute a defense available to, or a legal or equitable discharge of, any Borrower, any other member of the Borrower Group, any surety or any grantor.

Section 2.7 Postponement of Subrogation.

The Grantor agrees that it will not exercise any rights which it may acquire by way of rights of subrogation under this Security Agreement, by any payment made hereunder or otherwise, until the prior payment in full in cash of all of the Obligations and the termination of all Commitments. Any amount paid to the Grantor on account of any such subrogation rights prior to the payment in full in cash of all of the Obligations shall be held in trust for the benefit of the Grantee and shall immediately be paid to the Grantee and credited and applied against the Obligations of any Borrower and each other member of the Borrower Group, whether matured or unmatured, such order as the Grantee shall elect; provided, however, that if

(a) the Grantor has made payment to the Grantee of all or any part of the Obligations, and

(b) all Obligations have been paid in full in cash, all Letters of Credit have expired or been terminated and all Commitments have been permanently terminated,

then, at the Grantor’s request, the Grantee will execute and deliver to the Grantor appropriate documents (without recourse and without representation or warranty) necessary to evidence the transfer by subrogation to the Grantor of an interest in the Obligations resulting from such payment by the Grantor. In furtherance of the foregoing, for so long as any Obligations or Commitments remain outstanding, the Grantor shall refrain from taking any action or commencing any proceeding against any Borrower or any other member of the Borrower Group (or any of its or their successors or assigns, whether in connection with a bankruptcy proceeding or otherwise) to recover any amounts in respect of payments made under this Security Agreement to the Grantee, except that the Grantor may file a proof of claim in a bankruptcy proceeding with respect to any Borrower or any other member of the Borrower Group in connection with any obligations owed by such member to the Grantor in the event that the Grantee has failed to file a proof of claim on the Grantor’s behalf by the second business day before the due date for such filing.

ARTICLE III.

REPRESENTATIONS AND WARRANTIES OF GRANTOR

The Grantor hereby represents and warrants to the Grantee that:

Section 3.1 Title to Collateral.

The Grantor is the sole owner of, and has good, valid, and marketable title to, the Collateral, free from all Liens, and the Grantor has full right and power to grant the Grantee a lien thereon and a security interest therein.

Section 3.2 Security Interest.

The execution and delivery of this Security Agreement creates a good and valid lien on and security interest in the Collateral. The Securities Account Control Agreement perfects such security interest.

Section 3.3 Authorization, Approval, Etc.

Except as have been obtained or made and are in full force and effect, no authorization, approval or other action by, and no notice to or filing with, any Governmental Instrumentality, regulatory body or any other Person is required for the grant by the Grantor of the security interest granted hereby or for the execution, delivery and performance of this Security Agreement by the Grantor or for the exercise by the Grantee of the rights provided for in this Security Agreement, other than those authorizations, approvals, actions, notices or filings set forth in Schedule 3.3 hereto.

Section 3.4 Bankruptcy Matters.

The Grantor has not made a general assignment for the benefit of creditors, filed any voluntary petition in bankruptcy or suffered the filing of an involuntary petition by its creditors, suffered the appointment of a receiver to take possession of all or substantially all of its assets, suffered the attachment or other judicial seizure of all or substantially all of its assets, admitted its inability to pay its debts as they come due, or made an offer of settlement, extension or composition to its creditors generally.

Section 3.5 Representations and Warranties under the Credit Agreement.

The representations and warranties of or pertaining to the Grantor contained in the Loan Documents to which it is a party are true and correct as of the date hereof to the same extent as if set forth in full herein.

Section 3.6 Location and Jurisdiction of Grantor

The Grantor’s principal place of business and chief executive office is located at 000 Xxxxxxxxx Xxxxxx, Xxx Xxxx, Xxx Xxxx 00000. Grantor is duly and solely organized as a corporation under the laws of the State of Delaware.

ARTICLE IV.

COVENANTS OF GRANTOR

Section 4.1 General Covenants Relating to Collateral.

Until such time as (i) the Borrower has repaid or otherwise reduced the Letter of Credit funding obligations of the Grantee by an amount equal to $2,316,855.08 and (ii) the Revolving Loan Commitments of Grantee have been permanently cancelled (and the LOC Pro Rata Share of Grantee permanently reduced) by a corresponding amount, in each case as determined by the Administrative Agent in its reasonable discretion (such date being referred to herein as the “Collateral Release Date”), the Grantor hereby covenants that, unless the Grantee otherwise consents in advance in writing:

Section 4.1.1 Collateral.

The Grantor shall (a) execute and deliver any and all documents, or cause the execution and delivery of any and all documents, necessary to create, perfect, preserve, validate or otherwise protect the Grantee’s lien on and security interest in the Collateral and the priority thereof, (b) maintain, or cause to be maintained, at all times the Grantee’s lien on and security interest in the Collateral and the priority thereof, (c) promptly upon learning thereof, report to the Grantee any matters that could reasonably be expected to materially and adversely affect the value or enforceability or collectibility of any of the Collateral, (d) defend the Collateral and the Grantee’s interests therein against all claims and demands of all persons at any time claiming the same or any interest therein adverse to the Grantee and pay all costs and expenses (including, reasonable attorneys’ fees and charges) incurred in connection with such defense, and (e) at the Grantor’s sole cost and expense, settle any and all such claims and disputes and indemnify and

protect the Grantee against any liability, loss, cost or expense (including, reasonable attorneys’ fees and charges), arising therefrom or out of any matter affecting any of the Collateral (provided, however, that if the Grantee shall so elect after the occurrence and during the continuation of an Event of Default, the Grantee shall have the right at all times to settle, compromise, adjust or liquidate all claims or disputes directly with the Grantor or any obligor of the Grantor upon such terms and conditions as the Grantee reasonably deems advisable, and to charge all costs and expenses thereof (including, reasonable attorneys’ fees and charges) to the Grantor’s account and to add them to the Obligations, whereupon such costs and expenses shall be and become part of the Obligations).

Section 4.1.2 No Change in Places of Business or Collateral.

The Grantor shall (a) maintain its places of business, its chief executive office and its jurisdiction of organization only in the locations and jurisdiction set forth in Section 3.6, and in such other places and jurisdictions as the Grantor may select, provided that the Grantor shall provide to the Grantee at least twenty (20) days’ prior written notice of any changes in or additions to the locations of the Grantor’s places of business, jurisdiction of organization, or of the Grantor’s principal office and shall make all filings in the applicable jurisdictions necessary to maintain the Grantee’s lien on and security interest in the Collateral and the priority thereof in connection with any such changes or additions and (b) keep and maintain the records and books of account relating to the Collateral only at the Grantor’s chief executive office.

Section 4.1.3 No Impairment.

The Grantor shall not take or permit to be taken any action in connection with the Collateral which would impair in any material respect the value of the interests or rights of the Grantor therein or which would impair the interests or rights of the Grantee therein or with respect thereto.

Section 4.2 Sale of Assets.

The Grantor shall not sell, lease, assign, pledge, transfer or otherwise dispose of any of the Collateral, whether now owned or hereafter acquired, except as expressly permitted by the Credit Agreement and the Securities Account Control Agreement.

ARTICLE V.

RIGHTS AND REMEDIES OF THE GRANTEE

Section 5.1 Miscellaneous Rights of the Grantee.

Upon the occurrence and during the continuation of an Event of Default, the Grantee shall have the right: (i) to declare all of the monetary Letter of Credit Obligations to be immediately due and payable, whereupon all such Letter of Credit Obligations shall become immediately due and payable without presentment, demand, notice of dishonor, protest or further notice of any kind, all of which are hereby expressly waived by the Grantor, anything contained herein to the contrary notwithstanding; (ii) to exercise any one or more of the rights and remedies exercisable by the Grantee under any other provisions of this Security Agreement, or any other

related agreement, or exercisable by a secured party under the UCC or under any other applicable law; and (iii) to exercise, in the name of the Grantor or in the name of the Grantee, such rights and powers with respect to the Collateral as the Grantor might exercise, including, the right to:

(a) enter into any extension, reorganization, deposit, merger, consolidation or other agreement pertaining to, or deposit, surrender, accept, hold or apply other property in exchange for, the Collateral or any part thereof;

(b) insure, process, and preserve the Collateral;

(d) receive, open, and dispose of mail addressed to the Grantor relating to the Collateral or any part thereof;

(e) collect and endorse, receive, and give receipts for all dividends, interest, rent, payments, proceeds, and other sums and property now or hereafter payable on or on account of the Collateral or any part thereof or on account of its sale or lease;

(f) initiate, pursue, compromise, settle or withdraw any claims, suits or proceedings pertaining to the Collateral or any part thereof or to any interest, rent or other payment on or on account of the Collateral or any part thereof or on account of its sale or lease;

(g) take possession of and endorse in the name of the Grantor or in the name of the Grantee, for the account of the Grantor, any bills of exchange, checks, drafts, money orders, notes or any other chattel paper, documents or instruments constituting all or any part of the Collateral or received as interest, rent or other payment on or on account of the Collateral or any part thereof or on account of its sale or lease;

(h) appoint another (who may be an employee, officer or other representative of the Grantee) to do any of the foregoing on behalf of the Grantee;

(i) execute (in the name, place and stead of the Grantor) endorsements, assignments and other instruments of conveyance or transfer with respect to all or any of the Collateral; and

(j) take any other action which the Grantee deems necessary or desirable to protect or realize upon its security interest in the Collateral or any part thereof, and the Grantor hereby irrevocably appoints the Grantee as the Grantor’s attorney-in-fact to take any such action, including the execution and delivery of any and all documents or instruments related to the Collateral or any part thereof

in the Grantor’s name, and said appointment shall create in the Grantee a power coupled with an interest which shall be irrevocable.

Section 5.2 Right of the Grantee to Take Possession and Foreclose.

Upon the occurrence and during the continuation of any Event of Default, the Grantee shall have the right and power to take possession of the Collateral and of any and all books of account and records of the Grantor relating to any of the Collateral, the right to place the Grantee’s representatives upon any premises on which the Collateral or any part thereof or any such books of account or records may be situated with full power to remove the same therefrom, and the right to exclude the Grantor and all persons claiming under the Grantor from any access to the Collateral or to any part thereof, and the Grantee and such representatives are hereby granted the irrevocable license to enter upon such premises for such purpose. The Grantee may require the Grantor to assemble the Collateral or any part thereof and to make the same (to the extent the same is moveable) available to the Grantee at a place to be designated by the Grantee which is reasonably convenient to the Grantor and the Grantee. The Grantee may render the Collateral or any part thereof unusable without removing the same from the premises on which it may be situated, and may sell the same on the premises of the Grantor if such Collateral or part thereof is situated thereon. The Grantee may make formal application for the transfer of all of the Grantor’s permits, licenses, approvals, and the like relating to the Collateral or to the Grantor’s business to the Grantee or to any assignee of the Grantee or to any purchaser of any of the Collateral to the extent the same are assignable in accordance with their terms and applicable law. Unless the Collateral is perishable or threatens to decline speedily in value or is of a type customarily sold on a recognized market, the Grantee will give the Grantor at least ten (10) days’ prior written notice of the time and place of any public sale thereof or of the time after which any private sale or any other intended disposition thereof is to be made, which notice shall constitute reasonable notice. In addition to exercising the foregoing rights, the Grantee may, to the extent permitted by law, arrange for and conduct the sale of the Collateral at a public or private sale, as the Grantee may elect, which sale may be conducted by an employee or representative of the Grantee, and any such sale shall be considered or deemed to be a sale made in a commercially reasonable manner. The Grantee may release, temporarily or otherwise, to the Grantor any item of Collateral of which the Grantee has taken possession pursuant to any right granted to the Grantee by this Security Agreement without waiving any rights granted to the Grantee under this Security Agreement, the Credit Agreement, or the other Loan Documents or any other agreement related hereto or thereto. The Grantor, in dealing with or disposing of the Collateral or any part thereof, hereby waives all rights, legal and equitable, it may now or hereafter have to require marshaling of assets or to require, upon foreclosure, sales of assets in a particular order. Each successor and assign of the Grantor, including a holder of a lien subordinate to the lien created hereby (without implying that the Grantor has, except as expressly provided herein, a right to grant an interest in, or a subordinate lien on, any of the Collateral), by acceptance of its interest or lien agrees that it shall be bound by the above waiver, to the same extent as if such holder gave the waiver itself. The Grantor also hereby waives, to the full extent it may lawfully do so, the benefit of all laws providing for rights of appraisal, valuation, stay or extension or of redemption after foreclosure now or hereafter in force.

Section 5.3 Right of the Grantee to Use, Operate and Maintain Collateral.

Section 5.3.1 Rights of the Grantee.

Upon the Grantee’s taking possession of all or any part of the Collateral in accordance with the terms of this Security Agreement or otherwise, the Grantee shall have the right to hold, store, and/or use, operate, manage, and control the same. Upon any such taking of possession, the Grantee may (but shall not be obligated to), from time to time, at the expense of the Grantor, make all such repairs, replacements, alterations, additions, and improvements to and of all or any of the Collateral as the Grantee may deem proper. In any such case the Grantee shall have the right to exercise all rights and powers of the Grantor in respect of the Collateral or any part thereof as the Grantee shall deem proper, including the right to enter into any and all such agreements with respect to the leasing and/or operation of the Collateral or any part thereof as the Grantee may see fit; and the Grantee shall be entitled to collect and receive all rents, issues, profits, fees, revenues, and other income of the same and every part thereof.

Section 5.3.2 The Grantee Has No Duty.

The powers conferred on the Grantee hereunder are solely to protect its interest in the Collateral and shall not impose any duty on it to exercise any such powers. Except for the reasonable care and preservation of any Collateral in its possession and the accounting for moneys actually received by it hereunder, the Grantee shall have no duty as to any Collateral or as to the taking of any necessary steps to preserve rights against prior parties or any other rights pertaining to any Collateral.

Section 5.4 Right of the Grantee to Appoint Receiver.

Upon the occurrence and during the continuation of any Event of Default, the Grantee shall, as a matter of right and without any requirement of notice, to the extent permitted under applicable law, be entitled to appoint a receiver for all or any part of the Collateral, whether such receivership be incidental to a proposed sale of the Collateral or otherwise. All disbursements made by the receiver under this Section 5.4 and the expenses of receivership shall be added to and be a part of the Obligations, and, whether or not said principal sum, including such disbursements and expenses, exceeds the indebtedness originally intended to be secured hereby, the entire amount of said sum, including such disbursements and expenses, shall be secured by this Security Agreement and shall be due and payable upon demand therefor and thereafter shall bear interest at the rate set forth in Section 2.3.F of the Credit Agreement.

Section 5.5 Remedies Cumulative; Delay Not Waiver.

The rights and remedies of the Grantee under the Credit Agreement, this Security Agreement, the other Loan Documents, or any other related agreement are cumulative and shall in no way affect, or deprive the Grantee of, or be deemed to constitute a waiver by the Grantee of any other rights or remedies allowed to the Grantee at law or in equity. No notice to or demand on the Grantor in any case shall entitle the Grantor to any other notice or demand in similar or other circumstances and the exercise of any one remedy shall not impair the Grantee’s right simultaneously or at any time or in any order to exercise any other remedy nor shall the exercise of any remedy in one case impair or otherwise affect the Grantee’s right or ability to exercise such remedy contemporaneously or again in the same case or in any other case. No failure or

delay by the Grantee in exercising any right or power hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any such right or power, or any abandonment or discontinuance of steps to enforce such a right or power, preclude any other or further exercise thereof or the exercise of any other right or power.

Section 5.6 Waiver of Rights.

To the extent permitted under applicable law, the Grantor waives all rights and remedies of a debtor or grantor under the UCC or other applicable law, and all formalities prescribed by law relative to the sale or disposition of the Collateral (other than notice of sale) after the occurrence and during the continuation of an Event of Default and all other rights and remedies of the Grantor with respect thereto. In exercising its right to take possession of the Collateral upon the occurrence and during the continuation of an Event of Default hereunder, the Grantee, personally or by its agents or attorneys, and subject to the rights of any tenant under any lease or sublease of the Collateral, to the fullest extent permitted by law, may enter upon any land owned or leased by the Grantor without being guilty of trespass or any wrongdoing, and without liability for damages thereby occasioned. In the event the Grantee elects to proceed with respect to the Collateral, separately from any real property, the Grantee shall give the Grantor at least ten (10) days’ notice of the sale of the Collateral, which shall for all purposes be deemed to be commercially reasonable.

Section 5.7 Compliance with Restrictions.

The Grantor agrees that in any sale of any of the Collateral whenever an Event of Default shall have occurred and be continuing, the Grantee is hereby authorized to comply with any limitation or restriction in connection with such sale as it may be advised by counsel is necessary in order to avoid any violation of applicable law, or in order to obtain any required approval of the sale or of the purchaser by any governmental regulatory authority or official, and the Grantor further agrees that such compliance shall not result in such sale being considered or deemed not to have been made in a commercially reasonable manner, nor shall the Grantee be liable or accountable to the Grantor for any discount allowed by reason of the fact that such Collateral is sold in compliance with any such limitation or restriction.

Section 5.8 Distribution of Proceeds.

All cash proceeds received by the Grantee in respect of any sale of, collection from, or other realization upon all or any part of the Collateral may, in the discretion of the Grantee, be held by the Grantee as collateral for, and/or then or at any time thereafter applied (after payment of any amounts payable to the Grantee pursuant to Section 6.2) in whole or in part by the Grantee against, all or any part of the Letter of Credit Obligations in such order as the Grantee shall elect. The Grantor shall remain liable for any deficiency. Any surplus of such cash or cash proceeds held by the Grantee and remaining after payment in full in cash of all the Letter of Credit Obligations, the termination or expiration of all Letters of Credit and the termination of all Revolving Loan Commitments shall be paid over to the Grantor or to whomsoever may be lawfully entitled to receive such surplus.

ARTICLE VI.

MISCELLANEOUS PROVISIONS

Section 6.1 Additional Actions and Documents.

The Grantor agrees that at any time, and from time to time, at the expense of the Grantor, the Grantor will promptly execute and deliver all further instruments, and take all further action that the Grantee may reasonably request, in order to perfect and protect any security interest granted or purported to be granted hereby or to enable the Grantee to exercise and enforce its rights and remedies hereunder with respect to any Collateral. Nothing in this Section 6.1 shall be construed as limiting the obligations of each Borrower under Section 5.11 of the Credit Agreement.

Section 6.2 Expenses.

The Grantor agrees to reimburse and save the Grantee harmless against liability for the payment of all out-of-pocket expenses arising in connection with the administration or enforcement of, or the preservation or exercise of, any rights (including the right to collect and dispose of the Collateral) under, this Security Agreement, including the reasonable fees and other charges of outside counsel to the Grantee arising in such connection, and all such fees and other charges shall be added to the Grantor’s obligations secured hereby.

Section 6.3 Notices.

Any communications between the parties hereto or notices provided herein to be given shall be sent in accordance with the provisions of, and to the addresses set forth in, Section 9.8 of the Credit Agreement.

Section 6.4 Release and Satisfaction.

Upon and after the occurrence of the Collateral Release Date (i) this Security Agreement and the security interest created hereby shall terminate and (ii) upon written request of the Grantor, the Grantee shall execute and deliver to the Grantor, at the Grantor’s expense and without representation or warranty by or recourse to the Grantee, releases and satisfactions of all financing statements, mortgages, notices of assignment and other registrations of security, and the Grantor shall deliver to the Grantee a general release of all of the Grantee’s liabilities and obligations under this Security Agreement and an acknowledgment that the same have been terminated.

Section 6.5 Benefit.

This Security Agreement shall be binding upon, and shall inure to the benefit of, the parties hereto and their respective successors, legal representatives and permitted assigns. The Grantor shall not assign any of its rights or obligations hereunder without the prior written consent of the Grantee.

Section 6.6 Amendments and Waivers.

No amendment, modification, termination or waiver of any provision of this Security Agreement, or consent to any departure by the Grantee therefrom, shall be effective unless the same shall be in writing and signed by the Grantee and the Grantor and shall comply with the provisions set forth in Section 9.6 of the Credit Agreement. Each amendment, modification, termination or waiver shall be effective only in the specific instance and for the specific purpose for which it was given.

Section 6.7 Headings.

Section and subsection headings contained in this Security Agreement are inserted for convenience of reference only, shall not be deemed to be a part of this Security Agreement for any purpose, and shall not in any way define or affect the meaning, construction or scope of any of the provisions hereof.

Section 6.8 Applicable Law; Entire Agreement.

This Security Agreement shall be governed by, and shall be construed and enforced in accordance with, the internal laws of the State of New York, without regard to conflicts of laws principles (other than Sections 5-1401 and 5-1402 of the General Obligations Law of the State of New York), except to the extent that the validity or perfection of the security interest hereunder, or exercise of remedies hereunder, in respect of any particular Collateral are governed by the laws of a jurisdiction other than the State of New York. This Security Agreement and the other Loan Documents constitute the entire understanding among the parties hereto with respect to the subject matter hereof and supersede any prior agreements, written or oral, with respect thereto.

Section 6.9 Severability.

The invalidity, illegality or unenforceability in any jurisdiction of any provision in or obligation under this Security Agreement shall not affect or impair the validity, legality or enforceability of the remaining provisions or obligations under this Security Agreement or of such provision or obligation in any other jurisdiction.

Section 6.10 Consent to Jurisdiction.

The Grantor hereby irrevocably and unconditionally submits, for itself and its property, to the nonexclusive jurisdiction of the Supreme Court of the State of New York sitting in New York County and of the United States District Court of the Southern District of New York, and any appellate court in respect thereof, in any action or proceeding arising out of or relating to this Security Agreement, or for recognition or enforcement of any judgment, and hereby irrevocably and unconditionally agrees that all claims in respect of any such action or proceeding may be heard and determined in such New York State court or, to the extent permitted by law, in such federal court. The Grantor agrees that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by law. Nothing in this Section 6.10 shall affect any right that the Grantee may otherwise have to bring any action or proceeding relating to this Security Agreement against the Grantor or any of its properties in the courts of any jurisdiction. The Grantor hereby irrevocably and unconditionally waives, to the fullest extent it may legally and effectively do so, any

objection which it may now or hereafter have to the laying of venue of any suit, action or proceeding arising out of or relating to this Security Agreement in any court referred to in this Section 6.10. The Grantor irrevocably waives, to the fullest extent permitted by law, the defense of an inconvenient forum to the maintenance of such action or proceeding in any such court. The Grantor irrevocably consents to service of process in the manner provided for notices in Section 6.3. Nothing in this Security Agreement will affect the right of any party hereto to serve process in any other manner permitted by law.

Section 6.11 Construction.

The Grantor and the Grantee each acknowledges that it has had the benefit of legal counsel of its own choice and has been afforded an opportunity to review this Security Agreement with its legal counsel and that this Security Agreement shall be construed as if jointly drafted by the Grantor and the Grantee.

Section 6.12 Counterparts; Effectiveness.

This Security Agreement and any amendments, waivers, consents, or supplements may be executed in any number of counterparts and by different parties hereto in separate counterparts, each of which when so executed and delivered shall be deemed an original, but all of which counterparts together shall constitute but one and the same instrument. This Security Agreement shall become effective upon the execution of a counterpart hereof by each of the parties hereto. Delivery of an executed counterpart of a signature page to this Security Agreement or to any amendments, waivers, consents or supplements hereof by telecopier shall be as effective as delivery of a manually executed counterpart thereof.

Section 6.13 Waiver of Jury Trial.

THE GRANTOR HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS SECURITY AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY (WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY).

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IN WITNESS WHEREOF, each of the parties hereto has caused this Security Agreement to be duly executed and delivered in its name and on its behalf, all as of the day and year first above written.

FIBERNET TELECOM GROUP, INC. as the Grantor

By:
		Name: Title:

DEUTSCHE BANK AG NEW YORK BRANCH, as the Grantee

By:
		Name: Title:


By:
		Name: Title:

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SCHEDULE 3.3

GOVERNMENTAL CONSENTS

None.

S-1

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Table of Contents

SECURITY AGREEMENT

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