Domain accounts failing to work after two days

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http://serverfault.com – I am trying to diagnose/troubleshoot an issue where users to a Sharepoint site are not able to login anymore after 2 days from an initial password change (these are domain accounts). The password gets changed by IT Support, and then after two days, they are not able to login. There is one (I know, bad, but I didn't decide this) DC with SQL Server, and a MOSS server. I have looked at the event logs, turned on auditing, got the netlogon log (kerberos logging) enabled, used netpwage to get password ages, but have not found any reason for this? I know that after the max password age the user can (HowTos)