WSUS Post Installation Failed

After adding the Windows Server Update Service role, WSUS start the post installation task to configure its settings. Sometimes this post installation task getting failed with below error.

“Fatal Error: Failed to start and configure the WSUS service”

With the error its output a log file which is located inside local temp folder. If you open this log file you will see below error.

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

To fix this error, open Internet Information Services Manager and remote “WSUS Administration” site and re-initiate post installation task on Windows Server Update Services console.

And it will successfully complete the installation.