I've confirmed that deleting the SPNs sets me back to where I was: Accessing the page using IE puts up an Authentication dialog which refuses network creds (but allows a local admin on the server to see the page). Opening the web with VS2005 works okay.

I can't edit my web - I get an IE authentication dialog and no credentials work and then I get the error: "Unable to open the Web http://server/appname . You are not authorized to perform the current operation". My account is a local admin on the server. Background: I'm using IIS6 on...