konqueror 2.2.2 and Mailman 2.0.8 (although the error is present with the Red Hat site's mailman v 2.0.1 (hacked) at: https://listman.redhat.com/mailman/admindb/rpm-list After entering the correct password, and authenticating, the preceeding error is returned with konqueror as the browser -- this error is not obtained with Netscape 4.77 or Mozilla 0.9.2.1 "Error decoding authorization cookie "
Works with the current version.