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500.21
Module not recognized
Description
The web server includes a number of modules to support different features. One of these modules has a problem and/or is not active. The web site might not be operational with this issue.
Occurrences
Frequency is relative to other Internet warnings and errors.
Solutions and Fixes
This issue can only be fixed by the web site owner.
Undefined solution - please let the webmaster know about this issue. [later_time2
cached-13]
Solution 2 of 2 - Notify Webmaster
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You might notify the webmaster about the issue. Include the error number and the address (URL) where the error occurred along with any other relevant details.
Many sites use an email address in the form webmaster@sitename.com where you replace sitename.com with the web sites address (don't include a www). Keep in mind with the amount of spam, they may use a different address and/or it might get ignored. Check the websites' contact information to get reliable contact information.
"500.21 - Module not recognized" is only supported by Microsoft IIS (Internet Information Services) web server version 7 and later.
The five hundred series of errors indicate something is wrong at the server and it is unable to complete the action.
While we believe this information up to date and accurate, FAQware is not responsible for any inaccuracies. If you find something that is out of date or inaccurate, please let us know at
so we can correct it.
