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In the previous post, I covered the “server not found” error that is a common and frustrating problem that may occur for a number of reasons after a configuration change, or when deploying a new server machine. Another common “what the hell just happened” error is the plain 503 “service available” error. In this post we'll look at why this error happens, and how to fix it.
Read about it here - https://mvolo.com/2006/10/19/where-did-my-iis7-server-go-troubleshooting-service-unavailable-errors.aspx.