How do I trun off casini web server?

I've got a website developed in VS2005 that works fine on my local dev
machine using the casini server, but when I publish it to the web, which is
using IIS (ASP.NET 2.0) it is flipping out. It's a multi threaded app and it
is doing really unpredictable things and eventually crashing IIS. I cannot
figure out how to switch my dev environment back to IIS so I can rule out
that difference. Can somebody help?

Chip


.