BQE Knowledgebase

HTTP Error 500.21

Problem: User is getting the following error:

HTTP Error 500.21 - Internal Server Error
handler "PageHandlerFactory-ISAPI-4.0_32bit" has a bad module "IsapiModule" in its module list

Cause: The error occurs because you have not installed the Internet Information Services (IIS) with all the components and options required.

Solution: To resolve this issue, go to the Control Panel > Programs and click 'Turn Windows Features on or off'. Make sure to select all the relevant options under the IIS module. 

windows features ao.png 

Note: See the KB article for details on how to add required components to IIS.

If the above solution does not work, then uninstall and reinstall IIS to fix any of the 500 series errors. 

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Article Details

Last Updated
17th of March, 2017

ArchiOffice, EngineerOffice, Web Suite

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