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

If you're running VS2010 or later, and have installed .Net 4.x or later, try renaming the "v3.0" subdirectory (e.g. "rename C:\Windows\Microsoft.Net\Framework\v3.0 v3.0.ORIGINAL"), reboot your machine, and try debugging again in Visual Studio.

This has been working like a bloody charm for me, but your mileage may vary, depending on what kind of development you're doing.

I've been running Visual Studio 2012 for two weeks like this, and I seriously cannot believe how fast things are (again!). Launching the debugger with F5 is instantaneous now, and stopping the debug session is also instantaneous. All sorts of buggy and laggy behaviours have ceased, and so far I haven't seen a single side effect.