EXHIBIT 23.01 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our report dated January 16, 2002 included in this Form 10-K, into the Company's previously filed Registration Statements on Form S-8 (File nos. 333-82252, 333-72518, 333-57672, 333-40456, 333-31484, 333-78087, 333-51945, 333-40645 and 333-38363) and (No. 333-36170) on Form S-3 of Concord Communications, Inc. /s/ Arthur Andersen LLP ARTHUR ANDERSEN LLP Boston, Massachusetts March 6, 2002