Exchange Server 2007 and Windows Server 2008 Outlook Anywhere not working

I have recently began working with Exchange 2007 and Windows Server 2008.  After I disabled UAC and all the firewalls (yes there is more then 1) it was actually usable.  I installed Exchange Server 2007 which I have done many times before and configured all the autodiscover settings and went to fire up Outlook anywhere and it did not work.  So I read around and saw there were some issues with IPv6 with Exchange Server 2007 SP1 if you did not have Update Rollup 4 or greater.  I had Update Rollup 8 installed so I did not think that would pertan to me.  So here is the errors I got:

When attempting to connect using Outlook 2007:

• The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

 

When I tested connectivity using http://testexchangeconnectivity.com I got the following:

“Failed to ping RPC Endpoint 6004 (NSPI Proxy Interface)”

So I went back to the server and tried to telnet to each rpc port on the CAS server. The ports RPC over HTTP uses are 6001, 6002, and 6004.  I could connnect to all of them except 6004.  The solution to the problem was to disable IPv6.  Solution below:

 I went to the network card properties and de-selected IPv6 and then went to the HOSTS file and commented out :::1    localhost then added the hostname and fqdn of the cas server.  This could be the same server you installed all of your roles on, or a seperate CAS server.  Then I added the ip address of the server as well:

ssfex1   10.1.2.2
ssfex1.ssf.voxns.com 10.1.2.2

Attempted to telnet to ssfex1 6004 and everything worked.  i tested connectivity at http://testexchangeconnectivity.com and all tests passed.  Then I tried Outlook 3007 again and was able to connect this time.

So apparently IPv6 is still an issue even if you have all of your patches on.