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.