SharePoint disable loopback check

Click Start, click Run, type regedit, and then click OK
In Registry Editor, locate and then click the following registry key: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Lsa
Right-click Lsa, point to New, and then click DWORD Value.
Type DisableLoopbackCheck, and then press ENTER.
Right-click DisableLoopbackCheck, and then click Modify.
In the Value data box, type 1 and then click OK.