HTTP Error 500.22 - Internal Server Error (An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.)

I receive this error when I view an application.

HTTP Error 500.22 - Internal Server Error (An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.)

.Net framework 2.0, 3.5 and 4 are installed and I am using SQL 2008. Can anyone tell me what the solution is for this error?

Solution 1:

This issue is caused by the pipeline mode in your Application Pool setting that your web site is set to.

Short

• Simple way Change the Application Pool mode to one that has Classic pipeline enabled.
• Correct way Your web.config / web app will need to be altered to support Integrated pipelines. Normally this is as simple as removing parts of your web.config.

• Simple way (bad practice) Add the following to your web.config. See http://www.iis.net/ConfigReference/system.webServer/validation

   <system.webServer>
       <validation validateIntegratedModeConfiguration="false" />
   </system.webServer>
  

Long If possible, your best bet is to change your application to support the integrated pipelines. There are a number of changes between IIS6 and IIS7.x that will cause this error. You can find details about these changes here http://learn.iis.net/page.aspx/381/aspnet-20-breaking-changes-on-iis-70/.

If you're unable to do that, you'll need to change the App pool which may be more difficult to do depending on your availability to the web server.

• Go to the web server
• Open the IIS Manager
• Navigate to your site
• Click Advanced Settings on the right Action pane
• Under Application Pool, change it to an app pool that has classic enabled.

Check http://technet.microsoft.com/en-us/library/cc731755(WS.10).aspx for details on changing the App Pool

If you need to create an App Pool with Classic pipelines, take a look at http://technet.microsoft.com/en-us/library/cc731784(WS.10).aspx

If you don't have access to the server to make this change, you'll need to do this through your hosting server and contact them for help.

Feel free to ask questions.

Solution 2:

In your web.config, make sure these keys exist:

<configuration>
    <system.webServer>
        <validation validateIntegratedModeConfiguration="false"/>
    </system.webServer>
</configuration>