Yeah, having friendly meatware nearby your remote is always the sure-fire cure to a non-responsive TeamViewer server. When I got back to my office where the remote is it looks like Windows 10 was not in sleep mode but was at the Windows 10 login screen even though I had left it in 'never' sleep mode. Got to experiment more with Windows 10 settings and find out if there's a setting or default that causes it to automatically revert to a login screen after some period of time. When this happens on the remote machine the TeamViewer 14 client will respond with a rejected authentication request.
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