IIS HTTP Error 503. The service is unavailable after importing shared configuration

Wednesday, June 26, 2013

When you are importing shared configuration from another IIS webserver you have to be sure that the importing IIS webserver contains the same role services. If not you could end up with application pools being shut down and HTTP 503 errors.

In my case it was because I didn’t install the role service IP and Domain Restrictions resulting in the following error which can be seen in the event viewer (eventvwr):

The Module DLL C:\Windows\System32\inetsrv\iprestr.dll failed to load. The data is the error.

After installing the role the problem was gone.

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