EXHIBIT 23.1
                                                                    ------------


CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


We consent to the incorporation by reference in the Registration Statement of
Network-1 Security Solutions, Inc. (the "Company") on Form S-8 (File No.
333-64066) of our report dated February 22, 2005 on our audit of the financial
statements of the Company as of December 31, 2004 and 2003 and for each of the
years then ended, included in the Annual Report on Form 10-KSB for the year
ended December 31, 2004.




Eisner LLP


New York, New York
April 11, 2005