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Fix: Fatal Error: Failed to start and configure the WSUS service in Windows Server 2012 and Server 2012 R2

I ran into a Windows Update Server configuration problem a few days ago at a customer’s site.  I was were trying to install/configure Windows Update Server on Windows Server 2012.  The error was "Fatal Error: Failed to start and configure the WSUS service"  while configuring WSUS.

Then I opened the temp log file of WSUS server as shown below. I was getting below marked error i.e. The request failed with HTTP status 503: Service Unavailable.
Actually issue was with the IIS WSUS Administration Website. So in IIS manager console I  deleted the "WSUS Administration" website as shown below.
Click Yes to remove selected site.
Now Complete the WSUS installation.