iPhone 3G active sync works over att 3G air but won't sync email, Calendar, contacts over wifi other wifi apps work fine.

iPhone 3G syncs well with activesync over 3G network but not over office wifi.  Email, calendar and contacts will not sync over a wifi connection at work  All other apps work over wifi and connection over wifi is strong. As soon as  turn off wifi 3g syncs email.  There must be different settings I am missing for local wifi activesync.
lasikdrAsked:
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sullivanr6Commented:
office wifi is blocking activesync ports at the firewall level.
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lasikdrAuthor Commented:
when you say office wifi do you mean in the physical wifi access point (Belkin router used as wifi access point? It has mac adress filter on but iPhone is allowed and I have full acces to internet through access point  default gateway )  Windows firewall turned off on server and all pc's in the office.
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lasikdrAuthor Commented:
I can access email through wifi at home but not at work.  I can access internet on iPhone at work through wifi just not email.  As soon as I turn off iPhone wifi I can access email through 3G
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jnicponCommented:
In my mind, the most likely setting to check would be DNS settings. Make sure your Exchange External/Internal URLs for the different Exchange components are congruent with your local and external DNS. Most likely, your phone can resolve your server externally, but not on the WIFI networks you are connecting from.
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lasikdrAuthor Commented:
Fixed by iPhone exchange technician. Thank you
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lasikdrAuthor Commented:
Fixed by iPhone exchange technician. Thank you
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MikeKaneCommented:
What was the fix for this please?
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