Log-off Event 4634 immediately after log-on

Our Windows 2012 R2 domain controller records a Log off Event 4634 (type 3) in Event Viewer almost immediately after a user has logged on. The Event Log states the user has successfully logged off.

However, the user remains connected and can access network resources.

Is this usual behavior and what could be causing it?

Many thanks in advance
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Hello ThereSystem AdministratorCommented:
4634: An account was logged off

For network connections (such as to a file server), it will appear that users log on and off many times a day. This phenomenon is caused by the way the Server service terminates idle connections.

If a user turns off his/her computer, Windows does not have an opportunity to log the logoff event until the system restarts. Therefore, some logoff events are logged much later than the time at which they actually occur.

ANONYMOUS LOGONs are routine events on Windows networks.

Microsoft's comments:
This event does not necessarily indicate the time that a user has stopped using a system. For example, if the computer is shut down or loses network connectivity it may not record a logoff event at all.

Hello ThereSystem AdministratorCommented:
Event 4634 does not mean the account logoff itself. It is categorized as related to a Logoff task. E.g. Exchange can generate these events...
So don't be concerned about it.

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matedwardsAuthor Commented:
Thank you.
We have a Sophos UTM that relies on Event 4768 to authenticates domain users to access the WAN. Unfortunately, it is terminating active clients. I noticed Log off events such as 4634 and wondered if these could be the cause of the premature termination but I do not believe it is. Many thanks for your help and simple example such as an Exchange event.

Many thanks again.
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