Asp. NET error: Solution for Server application unavailable

Error: Server application is not available the Web application you are attempting to access on this Web server is currently unavailable. Please click the "Refresh" button in the Web browser to retry your request.

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 is found in the application event log of the Web Server. Please review this log entry to discover what caused this error to occur.

Error TIP: Server application is not available
The Web application you are attempting to access on this Web server is currently unavailable. Please click the "Refresh" button in the Web browser to retry your request.

Administrator considerations: The error message detailing the reason for this particular request failure can be found in the WEB server's system event log. Please check this log entry to find out why this error occurred.

WORKAROUND: Exclude the directory permissions issue, give the site directory to the Network service users all the permissions can!