ISAPI Tomcat redirector on IIS 8 of Windows Server 2012 - special chars in URL

When using ISAPI Tomcat redirector on IIS 8 of Windows Server 2012, we faced with the problem of the URL having special chars such as colon (:) character. We had a T5 app that makes AJAX requests and returns IIS error page instead app's JSON data as expected. After debug, I found out that the IIS handles that url (has colon characters) by itself but not lets the ISAPI Tomcat redirector to do that.

The IIS might returns the error like: A potentially dangerous Request.Path value was detected from the client (:).

We might re-factor the app to use normal characters instead colon character but it requires more effort since the function relates to other libraries and have to test all functions...

I tried to place the Tomcat redirector on the top of the ISAPI Filters list or remove all ASP.NET filters, but both ways didn't work either.

Finally, I reconfigured the application pool to remove .NET framework (to No Managed Code) and it worked.