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Event ID: 12052 Source: WindowsServerUpdateServices

The DSS Authentication Web Service is not working.
EV100621 (Windows Update Services Multiple Errors in Event Viewer) provides a solution for this type of problem (the steps the reconfigure WSUS).
EventViewer Errors shows: 13042 13002 12002 12042 12052 - In my case I found the solution at EV100372 (Windows Server - Event Viewer Errors 13042 13002 12002 12042 12052). The solution was to give *WRITE* access to Network Service on the folder %systemroot%\Temp.
Make sure that in IIS, the application "DssAuthWebService" is using ASP.NET 2.0.x instead of ASP.NET 1.1.x. Change this on the "application" level or on the "default website" level depending on your environment.
As per Microsoft: "Downstream server authentication service is not working end to end. This may be because of configuration issues". See the link to "Microsoft Event ID 12052 from source Windows Server Update Services" for additional information about this event.

From a newsgroup post: "Make sure the value for PortNumber under the "HKLM\SOFTWARE\Microsoft\Update Services\Server\Setup" key is set to the correct port (the one your WSUS site is on)".

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