I recently built a Windows 2000 server and installed active directory and ISA server. I have 2 Windows XP Pro machines, both at SP1, which I added to the domain. Both machines can log on to the domain successfully, but the following error appears in the system log on one of the machines -
Event ID 7 Source: Kerberos "The kerberos subsystem encountered a PAC verification failure. This indicates that the PAC from the client COMPUTERNAME$ in realm DOMAIN.LOCAL had a PAC which failed to verify or was modified. Contact your system administrator."
This machine takes an age to connect to a web site when a new browser is launched, locks up periodically and takes minutes to bring up task manager when it does, and refuses to shut down completely - it hangs at "Saving settings". These appear to be the only symptoms at the moment, and they were not present before joining the domain.
I have tried Microsoft's knowledge base and various other internet sources but cannot find anything relating to this error.