Network Administrator Knowledgebase

Jul 2 2008   7:53PM GMT

“Outlook Anywhere” and problems with IPv6 in Windows Server 2008

Michael Khanin Michael Khanin Profile: Michael Khanin

It’s not a secret, that IPv6 has some “issues”. When I’ve been in Seattle, at last MVP summit, a lot of IT professionals said that, and all of them recommended to disable IPv6 on Windows 2008 or / and Vista machines. Kevin Reeuwijk from “Innovative Technology Weblog” posted a very good article; Outlook Anywhere is ‘broken’ on IPv6 in Windows Server 2008.
So, if you run Exchange 2007 on Windows Server 2008 and want to use Outlook Anywhere (aka RPC over HTTP) you probably get a problem. It would not work if the RPC-over-HTTP Proxy and the Exchange Mailbox installed on the same Windows 2008 Server.
To make the long story short, simply unselect IPv6 from the properties of your NIC AND (it’s very important) make a changes to the HOSTS file. Simply open up your hosts file and make the following changes:

  • Comment out the line “:::1    localhost”
  • Add the following two lines:

         <IPv4 address>    <hostname of the computer>
<IPv4 address>    <FQDN of the computer>

This will resolve all queries for your computer’s name to its IPv4 address, effectively disabling the use of IPv6 for self-communication. You can confirm that this works by doing a “telnet localhost 6004″.

2  Comments on this Post

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  • Gbmichael
    Thank you. Just Migrated our server and this was the fix. Appreciate it more than you know. (Made me almost look smart!!!) Greg
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  • Danman32
    THANK YOU THANK YOU THANK YOU THANK YOU! This has been driving me NUTS! Some users in our organization were fine, others not with RPC/HTTP. My manager thought I was doing something wrong, as he had no problems whatsoever. And I am the Exchange administrator! Though currently not so versed with E2k7 yet, nor W2K8's nuances. I was ready to rip appart the Client Access and redo it. I thought maybe it was because I was using Outlook 2003 yet my manager was using 2007. But others with 2003 weren't having issues. But my laptop was able to do fine, so maybe Vista, which is the OS on my home desktop? I think someone else too had Visa and Outlook 2003. I even tried a brand new user account on my vista in case it was a bad IE setting or something. Did what you said and NO MORE PROBLEMS!
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