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Sophos NAC Advanced: The NAC Agent can fail registration during an upgrade even when the NAC application server is in maintenance mode.

NAC Agent registration will fail during a Sophos NAC upgrade if the NAC Agent is registering for the first time. The NAC Agent registration failure occurs even if the NAC application server is in maintenance mode.

What to do

There are two workarounds:

If you need more information or guidance, then please contact technical support.