What is debugattach.aspx and why can't the server find it?

Question

I\'m developing on an XP (SP3) machine with VS 2010 and IIS 5.

I have two versions of the same site. We\'ve released our first production version, so I forked the c

Answer 1

I had a wildcard script map for the .NET 4 version of aspnet_isapi.dll that was causing this. I was able to change the script mapping to ignore the DEBUG verb (by only using the verbs I needed for my app) and that enabled VS to attach automatically.

Having said that, I ended up using either the VS development web server or IIS Express to get my site working on an XP machine, because IIS 5.1 didn't like the combo of the wildcard script map and ASP.NET routing.