EXHIBIT 32.2

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 Annual Report of Concord Communications, Inc. (the “Company”) on Form 10-K for the year ending December 31, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Melissa H. Cruz, Executive Vice President, Business Services, Chief Financial Officer and Treasurer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

      1.     The 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 results of operations of the Company.

/s/ MELISSA H. CRUZ

Melissa H. Cruz

Executive Vice President, Business Services,

Chief Financial Officer and Treasurer

March 15, 2004