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iphone email WIFI sync while in LAN

Last Modified: 2013-12-23
A user has an iphone 4 and is able to sync email over 3g without a problem but when they are inside our company LAN with WIFI enabled the phone won't sync.

I have read somewhere that this is a networking error relating to DNS and not specific to the iphone but thats all i know and I'm finding it hard to fnid a solution as I don't really know what you call the problem.

We are running server 2003 and exchange 2003 sp1
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