SharePoint 2010 web applications with host header eventID 4625 – 0xc000006d

I made a new web application today on my SharePoint 2010 development machine through Central Administration and entered a Fully qualified domain name FQDN as url like http://company.intranet and added the mapping in my host file.

When trying to connect to my new web application / root site collection I got a pop-up windows asking my login 3 times after which I just got a blank screen.

I ping’ed the url and it did return my 127.0.0.1 IP so I was sure the address lookup was correct.

In the event viewer I could see an error with eventID 4625 and error 0xc000006d.

Turns out this is quite normal and by design, it’s a safety precaution in IIS. I found the solution on thisblogpost.

When you use integrated authentication and you have the website as a local IIS site, then you will only be able to access the website using the machine name (http://codejourney). You will not be able to access it using a FQDN.

How to disable loopback check for local IIS websites:

There are 2 ways to get past this annoyance.

Both solutions require registry editing, so remember to create a backup first.
Solution 1 (Preferred): Specify which host names that does not cause loopback check.

1: Open up the registry editor by typing regedit under Run.
2: Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0
3: Right-click MSV1_0 and click New and choose to make it a Multi-String Value.
4: Enter BackConnectionHostNames as name for the entry, and double-click it to modify it.
5: Type the hostnames you need to use (code-journey.com for instance).
6: Restart IISAdmin Service (“Start” -> “Administrative Tools” -> “Services”)

Solution 2 (Not recommended):
1: Open up the registry editor by typing regedit under Run.
2: Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
3: Right-click Lsa and click New and choose to make it a DWORD Value.
4: Enter DisableLoopbackCheck as name for the entry, and double-click it to modify it.
5: Set the value to 1 and click OK

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