IIS 7 default URL rewrite

IIS 7 provides Cookieless feature by default for ASP.NET applications while it may break MVC4 controller to certain extent like editing or creating record based on the model and database connection provided.

This article http://msdn.microsoft.com/en-us/library/aa479315.aspx explains what additional string means in the URL returned by IIS.

URL patterns in trouble would be like these:
http://server_URL/A(XXXXX)/...
http://server_URL/S(XXXXX)/...
http://server_URL/F(XXXXX)/...

To check IIS configurations, please refer to the following article:
http://technet.microsoft.com/en-us/library/cc754725(v=ws.10).aspx