I had this happen once. I created a GPO to setup the computers to use WSUS to include adding WPP's certificate. For some reason, one of the computers was moved out of the container assigned the GPO so it did not have the settings any more. When I used WPP to check the status of the computers, one kept showing 'Not Applicable'. After I discovered this, I moved it back and the group policy settings were re-applied. If you used local policy, check and make sure the certificate and relevant policy settings are still intact. In any case, just passing this along.
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