Global.asax Application_BeginRequest not firing unless physical file exists - 404

Question

I use URL rewriting (HttpContext.Current.RewritePath(...)) inside Global.asax so the physical files mostly don't exist. Everything was working fine until I had to remove site from IIS (8.5) and add it again.

And now I get 404 not found for every request. Example http://localhost/site/article123 And Global.asax Application_BeginRequest event not even firing.

If I however will add empty default.aspx file in folder /site/article123 everything starts to work fine with URL being correctly rewritten.

Files have not changed, so it's ought to be the problem with IIS configuration.

I do have following inside web.config:
<modules runAllManagedModulesForAllRequests="true">

Project in IIS is set as an Application with Application Pool .NET v2.0 Classic

Edit:
Same story in IIS 8.0

Answer 1

The problem was in Managed Pipeline Mode set as classic. Switching from classic to integrated by changing Application pool from .NET v2.0 Classic to .NET v2.0 sorted the problem.

As I understood this: in classic mode IIS is managing requests, while in intergated mode incoming IIS requests map to the ASP.NET engine.

More on pipeline modes: What is the difference between 'classic' and 'integrated' pipeline mode in IIS7?