If you’re trying to access your SharePoint site via a host header from your SharePoint server you may encounter a series of login prompts followed by a blank screen. To remedy this, you can either make the site available on another port, or you can add a registry setting. This is how you would add the registry setting:
- Open Regedit.exe
- Navigate to: HKLM\System\CurrentControlSet\Control\Lsa\MSV1_0
- Create a Multi string value key with name BackConnectionHostNames.
- Add SharePoint Web Application Host-Header Name as the value to this key (without the protocol http://)
That’s it, try navigating to the site via the host header and log in again and it should take you right in this time.