I have a fresh install of WSUS on a fresh install of Windows Server 2012R2. I have edited group policy to have our desktops use our internal WSUS server for updates. The only client showing in the WSUS console is the WSUS server itself. I tried reinstalling WSUS on Windows Server 2016 and I get identical behavior. I ran the Solarwinds Diagnostic Tool for the WSUS and the first two sections are fine. The last section, WSUS Server Connectivity, fails with "Cannot Connect - caused by a network infrastructure fault making the Windows Update unavailable ..."
Any assistance would be appreciated.