This is a description of my problem. I have three Win2KSP2 DCs and two NT4.0SP6a BDCs all members of the same domain. I have a user whom is member of a group, domain admins who?s account locks out about twice a day. There are no events in any of the security logs to indicate what is causing the account to lock other than lots of Service Ticket Request Failures associated with this user?s account and the Win2KSP2 Pro workstation (the user?s primary location) trying to access NT4 resources throughout the network. In fact, all of the W2K Pro machines and their respective users seem to log security events of this nature but only this one account locks. I have checked to see if there are any services domain-wide running with this users logon credentials but have found none. Also, I have been closely monitoring suspicious activity for this account and machine and have seen none. Any ideas?