troubleshooting Question

Exchange 2003 and Exchange 2010 configuration for ActiveSync

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neilbuckman asked on
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We are almost there...

We have one Exchange 2003 server and one new Exchange 2010 server.  We will migrate all the mailboxes to the 2010 server in due course and decommission the 2003 server.

It is all good except for ActiveSync.  When we switched the incoming mail flow from our firewall to the 2010 server, ActiveSync, used by iPhones, would not work.  The message on the 2010 server was that a proxy call to the 2003 server timed out.  I expect this is to do with the settings or a routing issue.  (We have integrated windows suthentication set on the 2003 ActiveSync web and the patch installed).

We have only 1 public IP address.  The external DNS has, and all pointed to that IP.  All port 25 and port 443 traffic will be routed by the firewall to the 2010 server (we tried this change then switched it back when activesync was not working).

I have in the hosts file on the 2010 server an entry for, pointing to the 2003 server.  That is obviouly not enough.  

Some people say they never use the settings and that Exchange sorts itself out in this simple setup.  Is that so?  Or do I need some hosts entries on the Exchange 2003 server as well?  What does the Exchange 2003 server look for to respond to ActiveSync requests?

This configuration could not be simpler.  There must be a standard way to set it up, but the more I read the more unclear it becomes...

All suggestions appreciated...


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