Error message when you try to log on to the Microsoft Dynamics CRM Web site from the Microsoft Dynamics CRM 4.0 server: "Request IP Address has differ

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Recently on a IFD deployment, i faced this issue "Request IP Address has different address family from network address". I got to know from (here) that this is a knows issue.

When you try to log on to the Microsoft Dynamics CRM Web site from the Microsoft Dynamics CRM 4.0 server, you receive the following error message:
Request IP Address has different address family from network address.
This problem occurs if the following conditions are true:
1. You run Microsoft Dynamics CRM 4.0 on a Windows Server 2008-based computer.
2. You use Internet-Facing Deployment (IFD) for Microsoft Dynamics CRM 4.0.

The fix for this is simple as posted here. Open your hosts files (:\windows\system32\drivers\etc\hosts) and add a line for your server name there with an IPv4 address. Reset IIS and this is it.

This solves the problem. :)
I hope this helps!!

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