Issue With Email On iPhone

We have clients who just got iphones.  When they connect to the internal network wirelessly they are unable to attach to the Exchange server. When they are off the network and connecting through 3G they are able to get on the server.  They are using a Sonicwall TZ-200 Firewall.  Any Ideas?
ComputerbilitiesAsked:
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ComputerbilitiesConnect With a Mentor Author Commented:
Apparently all I had to do to fix the issue with the iPhones was anable 'any any' on the WAN > LAN part of the firewall on the sonicwall. That problem is now resolved.
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thomasdavisCommented:
Is the exchange server on the same network as wireless? or are they on separate and sonic wall is blocking ports between the two networks?
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ComputerbilitiesAuthor Commented:
The exchange server is on the same network as the wireless. The Sonicwall TZ 200 is the main firewall/router for the network and it is supplying the wireless as well.
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thomasdavisCommented:
almost sounds like an authentication problem when they are connected internally and not on the domain.  If a computer on the wireless network not connected to the domain tries to use outlook to connect to exchange do they have the same issue?
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thomasdavisCommented:
Is it just the iphones or do other people with droids use the wireless side with email?
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ComputerbilitiesAuthor Commented:
If a computer is on the wireless network it does not have an issue.  I believe it to me more of a Firewall rule not allowing traffic internally to come back in once it leaves.  For now it is just an iphone issue, they do not have any other phones to test on.  Just some Blackberry's but they are using a BES.
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Vaseem MohammedCommented:
Which version of exchange u hav?
Can users access OWA when they are on wireless network? E.g webmail.domain.com/owa
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Syed_M_UsmanSystem AdministratorCommented:
Dear you need to make sure active syns is enable on your exchange...
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ComputerbilitiesAuthor Commented:
The other comments were great ideas but in the end it was just a small configuration change on the Sonicwall.
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