+ 0 Votes insufficent information CG IT 6 years ago Service Pack 3? I show only SP2 available to the general public. In any event, use of password complexity is Not enforced by default in Windows Server 2003. you have to set the policy by using the default domain group policy. The password filter used to enforce password complexity is Passfilt.dll. Though possible but not probably, this dynamic link library file could have been corrupted.