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Exchange 2010 does not proxy to Exchange 2003 ActiveSync

Hello,
I am in the middle of a migration to Exchange 2010, and we are having issues with ActiveSync for users with their mailboxes still on Exchange 2003. On an iphone, the account info verifies, but no mail is received. Using the ExRCA we get the following:

An ActiveSync session is being attempted with the server.
 Errors were encountered while testing the Exchange ActiveSync session.
 
Test Steps
 
Attempting to send the OPTIONS command to the server.
 Testing of the OPTIONS command failed. For more information, see Additional Details.
 
Additional Details
 Exception details:
Message: The operation has timed out
Type: System.Net.WebException
Stack trace:
 at System.Net.HttpWebRequest.GetResponse()
 at Microsoft.Exchange.Tools.ExRca.Extensions.RcaHttpRequest.GetResponse()

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I tested this internally before, but now it's not working. On exchange 2003, I have set the proper authentication types on the ActiveSync virtual directory, as well as removed the SSL requirement for it, as Exchange 2010 proxies with HTTP.

Any help is appreciated.

ASKER CERTIFIED SOLUTION

Simon Butler (Sembee)

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SOLUTION

Akhater

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indigo6

ASKER

I had already enabled Windows Integrated Auth. In this case, since we had a single server combination front end / back end Exchange 2003 server, it took several things to get Exchange 2010 to proxy Exchange 2003 for ActiveSync:

1. Enable Windows Integrated Authentication on the Exchange Active Sync Virtual directory on the Exchange 2003 server using the Exchange System Manager. (Install this hotfix if necessary: http://support.microsoft.com/?kbid=937031)
2. Disable Forms based authentication on the Default Web Site on the Exchange 2003 server. I did not have to reset the Directories though. A simple restart, or restart of the IIS services did it.
3. Disable the SSL requirement on the Exchange, and Exchange Active Sync virtual directories. (Since the Exchange 2003 server no longer faces the Internet) Again, restart the services, or reboot the server.

I then tested via the ExRCA and all was well! (And all the phones worked)

Thanks!