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I've written an ISAPI extension using Visual Studio 2012 on windows 7 that is a very simple passthrough wildcard extension. When compiled as 32 bit, and with the app pool set to allow 32 bit applications the filter works well. But when I compile as 64 bit (and change the pool to NOT allow 32 bit) I get a 500 error with the code 0x8007007f. 64 bit depends shows all green. There are no errors in the event log. I tried moving the DLL to C:\Windows\System32 but am getting the same error. Any help would be greatly appreciated.

Thanks

Marc

mlbiam
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1 Answers1

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The reason might have been that the 64 bit DLL did not export the functions HttpExtensionProc and GetExtensionVersion, which the error name hints at:

Logfile:
Notification
EXECUTE_REQUEST_HANDLER 
ErrorCode
The specified procedure could not be found.
 (0x8007007f)

I had missed adding the .def file to the linker options in my project.

SUNIL DHAPPADHULE
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Martin Brenner
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