IIS 7 and Above
The page you are requesting cannot be served because of the ISAPI and...
Re: The page you are requesting cannot be served because of the ISAPI...
Jun 08, 2012 05:42 AM|peterviola|LINK
If you have application that works and 1 that doesn't on the same server then you need to identify why the other application isn't working.
Your server admin should be able to tell you what's in the CGI restriction list.
appcmd list config /section:isapiCgiRestriction
Setup a test server, match the CGI restrictions, and tweak your appliction until it works properly.