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In reference to this article (http://support.apple.com/kb/TS1868) I need to figure out how to get iPhones working with Exchange over wifi and the data connection.

The data connection works fine, but while the iPhone is on wifi (which is the same network the Exchange server lives on), it cannot determine a viable route to the Exchange server. Now there are two CNAME records for webmail.thedomain.com and mail.thedomain.com which point to the A record for the server. Internally, you can successfully ping both of those addresses (one being what the iPhone thinks of the Exchange server) and return a local IP. Yet, still no connectivity.

Turning off wifi really is not a solution. Has anybody found a viable, permanent solution?

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I suspect you need to provide more details. Because my iOS devices work on my wifi just fine. I didn't need to do anything special to make them work. Have you tried capturing the traffic between the iphone and exchange server? – Zoredache Aug 2 '10 at 20:03
Yeah, I think a complete packet capture should be next. Your Exchange server is on the same network (subnet even) as your wifi connection? – MisterITGuy Aug 3 '10 at 13:26
Anyone have any luck with this? We just started experiencing this as we changed the domain for the e-mail. Works fine in Outlook and WP7. Doesn't work on iPhone on Wifi. – Noah Apr 27 '11 at 17:11
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