IIS 7 & Exceptions...

Here I would like to post the exceptions I've seen with IIS 7 setup and resolutions. I will keep the list dynamic and try to add more as they come. Comments/questions are welcome:

System.Security.SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission....
There might be other solutions to it, but common issue I noticed was when the AJAX (or other) dll's were copied from older version (may be IIS 6 version) the server 2008 default blocked them. Simply identify the dll's (or all dll's under bin) and check properties to see if the security warning says about being blocked. If so, unblock to get this issue resolved. Try restarting IIS and checking if at first it doesn't seem to work.

Love coding!