Event ID 529 Unknown User Name Or Bad Password

Event ID 529
Description:
Logon Failure:

   Reason:     Unknown user name or bad password
   User Name:  GUEST
   Domain:     NameOfYourDomain
   Logon Type: 3
   Logon Process: NCPSrv
   Authentication Package:
   Workstation Name:
				

MORE INFORMATION

The above scenario has been linked to other domain controllers in the domain running out of resources. At this point, you will need to check all of the servers in the domain that validate user accounts.

Check all the servers in the domain that validate user accounts for:

• servers that are running out of disk space.
• servers that have stopped responding (this may mean actually visiting the server).
• servers that report Event IDs stating they have not been able to synchronize with the PDC. The server will report that insufficient system resources exist to complete the requested service.

After you find the domain controller with insufficient system resources, you may either take that server offline, so that it is not involved in the validation process, or fix the resource problem and re-synchronize the domain controller with its PDC. If the problem persists, you may need to take a trace of the Windows 95 computer while it is trying to log on to the domain to help further identify problem areas.