FalconStor Software (FALC) 10-K 2005 FY Annual report

                                                                    Exhibit 32.2

                    CERTIFICATION OF CHIEF FINANCIAL OFFICER

      Pursuant to Section 906 of the  Sarbanes-Oxley  Act of 2002 (18 U.S.C. ss.
1350),  the  undersigned,  James Weber,  Chief  Financial  Officer of FalconStor
Software, Inc., a Delaware Corporation (the "Company"),  does hereby certify, to
his knowledge, that:

      The Annual Report on Form 10-K for the fiscal year ended December 31, 2005
of the Company (the "Report")  fully complies with the  requirements of Sections
13(a) and 15(d) of the  Securities  Exchange  Act of 1934,  and the  information
contained in the Report fairly presents, in all material respects, the financial
condition and results of operations of the Company.


                                                      /s/  James Weber
                                                      --------------------------
                                                      James Weber
                                                      Chief Financial Officer
                                                      March 15, 2006