I just upgraded my web server's .NET framework from 2.x to 4.0 and now none of the websites defined on that web server recognize a default document.
Any attempt to visit a site purely by its site name, without explicitly specifying the page name (such as index.aspx) results in the following message:
Server Error in '/' Application.
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested URL: /eurl.axd/4eb02f017f0f2e46abc4363cdbf98865/
Any thoughts on what may have happened?