Troubleshooting 404 errors when reverting from Classic mode to integrated pipeline on IIS 7?

Question

Ideas to troubleshoot 404 errors when reverting from Classic mode to integrated pipeline on IIS 7?

Answer 1

Having previously set a Wildcard Script Map under classic mode, you may be missing the UrlRouting Handler.

Ensure wildcard script map is removed from Handler Mappings.

Then add the UrlRouting handler if not present:

Your Website >> Handler Mappings >> Add Managed Handler

Request Path: UrlRouting.axd
Type: System.Web.HttpForbiddenHandler, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Name: UrlRouting Handler