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iPhone Unable to Verify Exchange account information

Situation: iPhone was working before. One day it just stops to receive emails. If we try to reset Exchange email, we receive "Unable to Verify Exchange account information".

Case 1: The company uses Cisco Wireless to setup Enterprise Wireless and Public Wireless. The public wireless can't loop back to the LAN so that the public wireless can't access to OWA.. When the iPhone turn on the wireless, the iPhone tries to use the public wireless to access the OWA. Turning wireless off fixes the problem.

Case 2: When the client has network and 3G on, he has problem to setup Exchange. The resolution is turn off the network until setup the Exchange.

More cases can be found this post: iPhone Unable to Verify Exchange account information

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