Exhibit 32.1 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the accompanying Annual Report on Form 10-K/A (Amendment No. 1) of I-Sector Corporation for the year ending December 31, 2004, we, James H. Long and Brian Fontana, Chief Executive Officer and Chief Financial Officer of I-Sector Corporation , herby certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of our knowledge and belief, that: 1. such Report fully complies with the requirements of section 13 (a) or 15 (d) of the Securities Exchange Act of 1934; and 2. the information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of I-Sector Corporation. April 11, 2005 /s/ James H. Long - ------------------------------------- James H. Long Chairman and Chief Executive Officer /s/ Brian Fontana - ------------------------------------- Brian Fontana Chief Financial Officer