IIS server reported "Server Application Unavailable" problem solving

  
                  

Deploy a web application on the IIS server. Here, when I deploy a web application that contains a WCF service, I will refresh the page again when I don't operate the web application for a while. "Server Application Unavailable".

It was later discovered that it was because of the application pool's --- advanced settings -- idle timeout problem, set it a little bigger.

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