Cookie issue with username length

Hi everybody, I have this issue with usernames: it appears that too long logins prevent users from logging in. What is the actual limit for login names, and is there a way to extend it? As a test I have registered on xwiki.org a user with a username having 100 characters, and they cannot login indeed. Locally I see the user is correctly authentified, but then there's a problem with the cookie. Here's the trace I get: ============== !remember-me cookie validation hash mismatch! !remember-me cookie has been tampered with! !remember-me cookie is being deleted! ============== That's a problem for me as my logins are based on the email address, and some have a length of 100 characters. Stéphane -- Stéphane Laurière slauriere(a)mandriva.com http://club.mandriva.com