I have a user that is getting repeatedly locked out of his Active Directory account. I have checked his mobile phone and removed and re-added the exchange account with the correct credentials. I have run rundll32.exe keymgr.dll, KRShowKeyMgr -- and removed all cached credentials. I have deleted the cached passwords from Internet Explorer. I have checked for any mapped drives and I have removed and re-added the Outlook profile.
I h ave also downloaded and ran the lockoutexaminer. This shows the orig. lock as one of our domain controllers.
I have checked the security event log on the DC for event 4740 and it shows the lockout and the caller computer name is our Exchange server.
The lockouts started happening after the last password change. I also tried changing the password back to the original password,but that did not help either
The lockout appears to occur at regular 15 minute intervals.
Is there anything else I can check to find the source of the account lockout?