Getting invalid argument when I use the internal url for an IFD CRM 2013

Hi,

I'm having problems using the internal url for my IFD setup CRM 2013. When I access the CRM with https://org.domain.se:444 (I have ADFS 2.0 on the same server) it all works fine, but when I try to connect with the internal address https://internal.domain.se:444/org I get an "Invalid argument" error and in the trace I get the following error after the windows logon box:

>Crm Exception: Message: Expected non-empty string., ErrorCode: -2147220989, InnerException: System.ArgumentException: Expected non-empty string.
Parameter name: userPrincipalName

and

>Crm Exception: Message: Expected non-empty string., ErrorCode: -2147220989, InnerException: System.ArgumentException: Expected non-empty string.
Parameter name: userPrincipalName

Any ideas what can be wrong here?

Thanks

Rickard Norström Developer CRM-Konsulterna
http://www.crmkonsulterna.se
Swedish Dynamics CRM Forum: http://www.crmforum.se
My Blog: http://rickardnorstrom.blogspot.se