If you are running into a weird issue, where you get prompted for your credentials repeatedly in your local sharepoint server and was denied access to the site, even though you are using an administrator account, and if this happens only when you create a nice host header and on 80 port, then you are here at the right place - Just read the below. Method 1 works for me : 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\MSV1_0 Right-click MSV1_0 , point to New , and then click Multi-String Value . Type BackConnectionHostNames , and then press ENTER. Right-click BackConnectionHostNames , and then click Modify . In the Value data box, type the host name or the host names for the sites that are on the local computer, and then click OK . Quit Registry Editor, and then restart the IISAdmin service. Reference : http://support.microso