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I am getting Authorisation requests failed log entries for a user however there aren't any successful authentication logs.
The user would never be able to authenticate as it no longer exists in ACS (it was the user for someone who left the company 3-4 month ago)
The other wierd thing is that the caller-id is 0.0.0.0
BTW the NAS is a Cisco ASA firewall running 8.0(3)
Thanks for the help
This usually happens if the user is still exist but has no privilege to the network (user is disabled or enabled but with no authorization to the specified device).
Make sure that the user is deleted. If you are talking about an AD user, then make sure to also delete the corresponding dynamic user in the ACS server.