I've had the following problems on multiple Windows networks (using domains) which have a password expiration policy:
After a while the user can't access network resources. This seems to be caused by the fact that the users password has expired, however s/he isn't notified about the fact that the password expired, even after multiple logins/logouts/reboots. Manually changing the password always resolves the issue. The machines are running up-to-date Windows XP. An other commonality seems to be that the given machines are rebooted rarely (once or twice a week).
While it is good to have a workaround, I would be interested in eliminating the source of the problem. Does anyone know what might be the root cause of this?
PS. A problem, which might or might not be related, is that some shares are only available when using their IP rather than their name...