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Event ID 534 - Logon Failure: Reason: The user has not been granted the requested

Q: One of the users loses the ability to login because the security event log is full. When I check the log, it is filled with event id 534, logon failure, "user has not been granted the requested logon type at this machine" and it lists a different user than the one who can't login. The user listed has not made any attempts to login to this particular machine!

A: Usually, when you see this type of behavior, you are actually looking at an
application (possibly malware) that is attempting to run a process as the
user indicated in the event log.  Your best bet is to track down the
workstation that the problem user is using and inventory any applications
that may be making network calls.

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