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The iPhone works when it's hooked to the local lan through WiFi, but when it has to go through the firewall (SonicWall NSA2400), it just says "Cannot Connect."

I can see OWA and OMA through the firewall using Safari, but mail just says "The connection to the server failed."

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I don't think we do mobile phone support here.. (don't ask me why) – Earlz Apr 9 '10 at 21:08
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This question is off-topic, as defined in the FAQ (superuser.com/faq). I recommend you ask this question on another site, like for example one from this list: meta.stackexchange.com/questions/4/list-of-stackexchange-sites PhoneHow (phonehow.com) and SlideToAsk (slidetoask.com) seem more appropriate for questions about iPhone. – Sathya♦ Apr 9 '10 at 21:09
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This is a question about OWA and Exchange. This is not in any way specific to the iPhone. – Satanicpuppy Apr 9 '10 at 21:24
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this is one of those gray areas that can be hard to determine whether it's on topic or not. judging from the answers i think @satanicpuppy is right, and this question is fine. though it seems more appropriate to Server Fault than here. – quack quixote Apr 9 '10 at 22:41
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Hrmph... I changed some permissions in IIS, and it started working. I'm not sure why it wasn't working from the start since OWA and OMA were working in Safari the whole time.

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this could be useful to others with a similar problem -- if you can, please give more details about what permissions were altered. thanks! – quack quixote Apr 9 '10 at 22:37
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You need to have the following accessible on the Exchange server:

/exchange 
/exchweb 
/public 
/OMA 
/Microsoft-Server-ActiveSync

That's for OMA and OWA and the basic ActiveSync stuff. Most times the problem is you don't have all of them allowed/proxied/whatever.

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