How do I set up debugging under my local IIS for an MVC3 app?

My host is having issues getting my MVC3 app to work on their server, so I though I'd check it out myself. Until now I've been too busy developing under the built in server to worry about IIS, but today I tried my first deployment to the host with no joy. Then I tried one to my local IIS, with no joy. Then I tried telling VS to use IIS for debugging, to maybe resolve some local issues, with no joy.

What steps and configuration are required to use local IIS 7.5 to debug an MVC3 application?

EDIT: Going through a browser, after clearing up a permission problem for my Windows user on Temp ASP.NET Files, I now site with a I get a HTTP Error 403 (Forbidden), but the occassional basic auth login dialogue. Here I have tried a Forms auth user, my normal Windows user, and my Windows admin user, all to no avail.

When I try and debug under VS, I get a 500, internal error.

THE PLOT THICKENS: When I enable director开发者_JAVA技巧y browsing on the site, I get a proper directory listing for the site root url. This suggests the the MVC3 routing is not working, but why not?

If you're getting a directory listing that means there's not a default file set (for IIS6). It usually means the request wasn't routed to IIS to deal with. thing are slightly different with II7 & it's integrated pipeline.

Simon