Installation shows no Organizations / 401 errors in the add-on / IP v6 and IFD

No. KBA-01047-SP57
Keywords: ip6, ipv6, 401
Last Modified: 16.06.2010

Problem
On the CRM server, IFD and IPv6 are enabled. The customaze add-on shows 401 errors or no organizations during installation and it does not work.

Solution

The problem lies in the IFD configuration that does not recognize IPv6 addresses as part of the on premise (Windows authentication) environment, but tries to use forms authentication. That fails for the add-on and thus the add-on is unauthorized.

A simple test if this is likely the problem is a PING to the CRM server's hostname on the command line. If that returns the IPv6 address instead of the IPv4 address, a simple solution is to add the following line to C:\Windows\System32\Drivers\Etc\Hosts:
127.0.0.1  crmservername

This forces IPv4 for connections to the CRM server.

Another option is to turn off IPv6 on the server until Microsoft fixes the problem with the IFD config tool.