dot1x Dropping out after 3 minutes

By RocketPotato ·
We've recently setup an 802.1x test environment prior to making any changes to our production network.

For the most part we've gotten it working and only authorized computers are able to connect. The issue however is that once authorized, if left idle for as little as 3 minutes (PC does not sleep in this time...)

A quick overview of the setup for the test environment:
2016 DC, 2012 CA/NPS, old Catalyst 2960 (WS-C2960-8TC-S running 12.2(46)SE)

When the PC is powered on we can see the machine being authorized in the NPS event logs. We do not however see it being denied/revoked/deauthorized.
If the user logs out and someone else logs in, the machine is once again authorized for another 3 minutes.
Constant activity (RDP session to DC from the PC) seems to keep it alive longer but it still does drop out sometime after 3 minutes.

Since I'm not seeing anything in the logs I'm leaning towards this being on the switch side but I'm honestly at a loss. PC's should be getting authorized by computer account, not user.

Any thoughts?

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