Exhibit 99.3

      CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
                                   PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

        I, Zvi Alon, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my
knowledge, the Quarterly Report of NetManage, Inc. on Form 10-Q for the fiscal
quarter ended September 30, 2002 fully complies with the requirements of Section
13(a) or 15(d) of the Securities Exchange Act of 1934 and that information
contained in such Quarterly Report on Form 10-Q fairly presents in all material
respects the financial condition and results of operations of NetManage, Inc.


                                            By: /s/ Zvi Alon
                                                --------------------------------
                                            Name: Zvi Alon
                                            Title: Chief Executive Officer

        I, Michael Peckham, certify, pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my
knowledge, the Quarterly Report of NetManage, Inc. on Form 10-Q for the fiscal
quarter ended September 30, 2002 fully complies with the requirements of Section
13(a) or 15(d) of the Securities Exchange Act of 1934 and that information
contained in such Quarterly Report on Form 10-Q fairly presents in all material
respects the financial condition and results of operations of NetManage, Inc.



                                            By: /s/ Michael Peckham
                                                --------------------------------
                                            Name: Michael Peckham
                                            Title: Chief Financial Officer