Sharepoint 2010 - Constantly prompting Username Password in local server.

This problem was also bugging me in Dynamics CRM.

İf you would have a server and try to access it inside, it constantly prompts you username and password.

In order to be able to solve this issue you need to add a new registry key

Run - regedit

Go to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa


Create a DWORD (32bit) key in the folder, named as:
DisableLoopbackCheck


Set the value as:
1


Close the regisrty window. By default (and best case) it does not need any restart of iis, explorer or server.


Source:
http://www.jeremytaylor.net/2010/05/24/sharepoint-disable-loopback-check-disableloopbackcheck-dword-in-registry/