EXHIBIT 23.1 ------------ INDEPENDENT AUDITORS' CONSENT The Board of Directors Network-1 Security Solutions, Inc. We consent to the reference to our firm under the caption "Experts" in the Registration Statement on Form S-3 of Network-1 Security Solutions, Inc. and to the incorporation by reference therein of our report dated February 21, 2001 with respect to our audit of the financial statements of Network-1 Security Solutions, Inc. included in its Annual Report on Form 10-KSB for the year ended December 31, 2000 filed with the Securities and Exchange Commission. Richard A. Eisner & Company, LLP New York, New York February 11, 2002