Funny ASPX handling by IIS?

Question

[This might be better on serverfault, if so, I'll move the question over there - but thought there's more asp.net devs here so more chance of this behaviour having been seen by someone else]

I've been trying to track down the .NET setting in IIS that governs this behaviour, but with no luck...

In brief, we have a Server 2008 R1 box running IIS7. When we navigate to a URL of the form: http://server/path/webpage.aspx/webpage.aspx, it processes the page correctly and returns the correct response. If I try this with a static HTML page or an ASP page, I get a 404 (expected).

It seems that there's no limit to the level of repetition ... http://server/path/webpage.aspx/webpage.aspx/webpage.aspx/webpage.aspx all runs as if we'd gone to the right URL in the first place (i.e., just a single webpage.aspx).

This is (or at least should be) a default configuration of IIS. Anyone any ideas whether we've got a box that's tweaked in some odd way?

Edits/answers to questions [last edit @ 16:55]:

• Using .NET 2.0
• IIS Application Pool is configured as 'Classic' pipeline
• IIS configured for anonymous access; using a classic (legacy) ASP front-end for authentication
• This is a mixed app: we have many legacy ASP elements as well as several ASP.NET elements.
• No custom HTTP modules are used

Ultimately this isn't causing a problem functionally: but it does mean log analysis is being thrown off, and if we can switch off this (rather unexpected) behaviour it'd be useful.

Answer 1

You need to provide more info:

1) Version of ASP.NET

2) IIS Application Pool and is it integrated or classic

3) Using no authentication, windows autehntication or forms

Answer 2

This is not IIS7 specific, but IIRC a feature of the way ASP.NET works: the script identified by the first .aspx will handle the request, and get a /webpage.aspx as the Request.PathInfo; this would happen to anything starting with a / after an ASP.NET page name, such as .aspx and .asmx, pages. So the following url is also handled by webpage.aspx: http://server/path/webpage.aspx/foobar.

If you look at .asmx web services, you'll find that the sample requests use such urls: http://server/path/service.asmx/WebMethodName.