blackdude,
You failed to provide sufficient information.
When the error manifests, is this user logging on to the DC?
When the error manifests, is the error reported on the DC?
When the error manifests, is the DC rebooting?
What version is KiX?
What OS are the clients?
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.