Website hosted on Plesk for Windows server is not accessible: 500 Internal Server Error: An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode

Symptoms

• A domain http://example.com or its statistics page http://example.com/plesk-stat/webstat is not accessible with one of the following errors:

  CONFIG_TEXT: 500 Internal server error

  ---

  CONFIG_TEXT: HTTP Error 500.24 - Internal Server Error
  An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode. 
  Detailed Error Information: 
  Module ConfigurationValidationModule 
  Notification BeginRequest 
  Handler ExtensionlessUrlHandler-Integrated-4.0 
  Error code 0x80070032 
  Requested URL http://example.com:80/ 
  Physical Path C:\Inetpub\vhosts\example.com\httpdocs 
  Logon Method Not yet determined 
  Logon User Not yet determined

• Also, the following error message can be found in failed request tracing report for a website based on ASP.NET 2.0 (Failed Request Tracing can be enabled in Plesk in Domains > example.com > Failed Request Tracing > Start Tracing):

  CONFIG_TEXT: ModuleName ConfigurationValidationModule
  Notification 1 
  HttpStatus 500 
  HttpReason Internal Server Error 
  HttpSubStatus 22 
  ErrorCode 2147942450 
  ConfigExceptionInfo 
  Notification BEGIN_REQUEST 
  ErrorCode The request is not supported. (0x80070032)

Cause

The website is designed for "classic pipeline mode", but the application pool of the website is in "integrated pipeline mode".

Resolution

Change the managed pipeline mode in the Plesk interface:

1. Log into Plesk;
2. Go to Domains > example.com > Dedicated IIS Application Pool for Website;
3. If the button Switch On with a green label is shown, then click on it to enable a dedicated pool for the website:
   
4. Once a dedicated pool for the website is enabled, choose the option Classic from the drop-down list in the Managed pipeline mode field.
   
5. Click OK to apply the changes.

Additional information

For more details about running ASP.NET 2.0 site with IIS 7.x, visit the following page.