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isapiModule 500 - The specified module could not be found - Server 2008

OK, I'm starting to lose hair. I've been through EE and many google searches in an effort to figure this out. I've inherited a project and we're simply trying to get the same bit of code to work on a new server.

This is Server 2008/IIS7. A proprietary .dll is being called and runs fine on one 2008 Server, but throws a 500 on the new one. The detailed error from the failed request tracing log is here:

ModuleName IsapiModule
 Notification 128
 HttpStatus 500
 HttpReason Internal Server Error
 HttpSubStatus 0
 ErrorCode 2147942526
 ConfigExceptionInfo
 Notification EXECUTE_REQUEST_HANDLER
ErrorCode The specified module could not be found. (0x8007007e)


I've gone through at the server level and application level to ensure the isapi.dll is referenced and given execute permissions as well as the proprietary .dll. Anonymous user has permissions on the directory of the proprietary .dll.

I used IIS 6 on Server 2003 in my hayday, so I'm a bit rusty and brushing up on the newer versions. Any help/clues are appreciated.

Thanks!
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mwidholm
Asked:
mwidholm
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1 Solution
 
mwidholmAuthor Commented:
Sorry I never responded back. I had seen those pages already. Our next step is to re-install IIS.
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mwidholmAuthor Commented:
Final resolution was to rebuild the server = not ideal.
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mwidholmAuthor Commented:
Not a great outcome, but it may have been a bad server install in the first place. This is a new company for me.
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