Authentication caches wrong login credentials

I am using
JBoss AS 4.2.3
JBossSeam 2.1

My Problem is that I can login/logout with different users as long as I do not enter a wrong password for one user.
If this happens it is not possible to authenticata any user. Authentication always fails.

If I delete the browser cookies everything works fine.

I have tried to set DefaultCacheTimeout and DefaultCacheResolution to 0 but without luck.

I hope someone can help me with this issue.

Thanks in Advance.

This looks like the browser is caching the credentials and not the server. Is it BASIC authentication method that you are using (the one which shows up the popup for username/password)?