Server Application Unavailable

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.

If your domain has hosted at server 2003 with plesk control panel
Cause : 1. If  you are using ASP.NET application and not assigning Dedicated Application Pool or any how it has failed to assign.
2. You are using more than one .NET application with same domain or subdomain in same application pool.

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