Server based Userprofile

I Use in my domain server based userprofiles. No problem with Windows XP, it
works well. But with Vista I've get always a message, that the server based
userprofile could not be found. In the eventlog on the Vista-machine I got a
message with teh even-ID 1521, access denied.

And in the security-event-log on der server 2003 I got a message with the
event-ID 675, failed pre-authentication.

Any solution for me?

Best regards

Joachim