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WSUS Post-Installation Failed

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WSUS Post-Installation Failed

After successfully installing Windows Update Server Service (WSUS) role in my  Windows 2012 R2 server I got the below error during post-installation.

CreateDefaultSubscription failed. Exception: System.Net.WebException: The request failed with HTTP status 503: Service Unavailable

In order to RESOLVE the issue, go to IIS Manager under ServerName -> Sites –> delete “WSUS Administration” site. Then re-run the Post-Installation task. It will be completed successfully.

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