How to fix an error "Server Application Unavailable "

Question: I am getting following error while browsing my ASP.NET application

Server Application Unavailable
The web application you are attempting to access on this web server is currently unavailable.  Please hit the "Refresh" button in your web browser to retry your request.
Administrator Note: An error message detailing the cause of this specific request failure can be found in the application event log of the web server. Please review this log entry to discover what caused this error to occur.

Solution (PLESK Windows 2003 server)
This error comes while you are using ASP.NET application and not assigning Dedicated Application Pool, or you are using more than one .NET application with same domain/subdomain in same application pool. To resolve this error kindly use following steps..

a. Login to your control panel
b. Select Domain Name
c. Go to Web Hosting Setup option
d. Scroll Down and locate option "Use Dedicated Application Pool"
e. Check the option and save
f. If it was already checked then uncheck the same, and save, then you require to following step c, step d, step e again to reassign application pool.

This should fix an error with immediate effect, if you still face issue kindly submit ticket with exact URL which is getting error.

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