Server application unavailable error Solution

Today, I installed a. Net 4.0 framework (originally with 1.0 and 2.0) on the server. After configuring the site, I chose 4.0 as the version. Access Error and errorCodeAs follows:

 

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.

 

 

After searching, I finally solved the problem,

Summary:

The most common method for service unavailability errors is

1. Check whether the. NET version in IIS is obtained

2. if the version is different, you must add an application separately.ProgramThe specific cause of the pool is the isolation mechanism of IIS applications, which can be searched by Baidu.

3. If no error is found, check whether the user group is added to the site folder (this is my error );

These situations are common, and other situations should be analyzed in detail.