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• In the GUI, select the server in the left-hand pane and click on the "ISAPI Filters" in the right.
  • Now remove any Shibboleth-related filters. Dependending on the IIS version, for a default install this will be called Shibboleth or ShibFilter and be for executable: C:\opt\shibboleth-sp\lib64\shibboleth\isapi_shib.dll
• In the GUI, select the server in the left-hand pane and click on the "Handler Mappings" in the Right.  
  • Now remove any Shibboleth-related ISAPI handler mapping (generally for path *.sso).  Dependending on the IIS version, for a default install this will be called something like AboMapperCustom-8689 and be for executable: C:\opt\shibboleth-sp\lib64\shibboleth\isapi_shib.dll

• In the GUI, select the server in the left-hand pane and click on the "ISAPI and CGI Restrictions" in the Right.  

  • Now remove any Shibboleth-related permission grant. For a default install this will be called something like Shibboleth Web Service Extension and be for executable: C:\opt\shibboleth-sp\lib64\shibboleth\isapi_shib.dll

• Edit %SYSTEMROOT%\System32\InetSrv\config\applicationHost.config and look for the words "shib" or "shib_isapi" and remove the elements containing these words.

• As well as the applicationHost.config file, you may need to inspect the web.config files for the sites and their subfolders.

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