I'm porting some old ASP/.Net applications over to a clean build of w2k8R2 running IIS7. The older .Net applications and some 3rd-party dlls require enabling 32-bit mode for the applications pools they run in. When I do this, error pages (both custom and detailed) disappear.
The correct error status is returned to a browser, but there is no content - just a blank page. This happens regardless of the custom/detailed local/remote Feature Settings for error pages and regardless of whether a local or remote browser is used. No errors are thrown that I can detect, just no content in the pages.
The fact that I can't find any references to this problem anywhere lead to suspect that it's a problem I've introduced earlier in the build. I can't see how, though.
Has anyone experienced anything similar?