iPhone/Exchange Sync is erroring out sporadicly

PrimosHC
PrimosHC used Ask the Experts™
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A little background, I have a SBS 2003 and exchange is on sp2.  I have had Active Sync working for at least 2-3 years on windows mobile devices and over a year, since OS 2.0 release, with iPhones.  My problem started sometime this past weekend.  What actually happens is during the synch, my email/contact/calendar all become empty and eventually an error pops up stating "Cannot Get Mail - Server error.   Contact your server administrator".  To get some obvious things out of the way, the server is connected to the internet and does not go down.  I have a metro-e 10 meg connection and I have no loss of service errors.  My message store is not going down or being brought down.  I have a Blackberry Enterprise Server, remote users using RPC over HTTPS and in office users that see no activity loss.  Only the iPhones are being effected, but I can't test Windows Mobile because all of my users have moved to iPhones and don't have a device.  

The crazy thing is that it only happens about every 4 synchs out of 10.  The other 6 work without any problems and all the contacts/calendar/email reappear.  This is really driving me nuts and I have spent way to much time trying to run down the source of the problem, but the iPhone does not give me any good information.  Anybody have any ideas?  All the iPhones have been upgraded to 3.0, but my personal was upgraded the beginning of last week and worked fine until Sunday or Monday of this week, so I don't think that is the problem.  The only thing I am thinking it might be is that I am at my CAL license limit on my SBS 2003, but I would think I would see the problem elsewhere like desktops or remote users also.  Any help would be appreciated.
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Commented:
I just tested Active Sync through wi-fi in our office and turning off the cellular antenna.  Have the same problem, so it is not internet or server connection problem.  
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Commented:
If it is intermittent I would look at DNS to begin with, ensure that everything resolves to the same place and there are not two sets of records floating around.
You could also confirm connectivity using the Microsoft test site and a test account:

https://testexchangeconnectivity.com/

Simon.

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Commented:
Don't think it is a dns issue because the problem happens internally using our wi-fi network, we have internal DNS servers.  Checked the record set and the server name is resolving to the correct ip.  Used the URL you suggested yesterday hoping to find a problem, but my exchange setup passed every test without a problem.  I really was hoping that one of the test, like the certificate or something would fail, but no such luck.  
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Commented:
The iPhone is a poor implementation of ActiveSync anyway.
Get hold of the Windows Mobile emulator which is a free download from MS and see what that does.

Simon.

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Commented:
I actually have the emulator in my VS 2005 setup.  I will try it out later tonight.  Thanks for the suggestion.
Commented:
Actually found the problem was with iSCSI initiator and ActiveSync binding to the wrong IP.  The iSCSI initiator had been added with a new network card a couple of weeks ago and was disabled.  One of my guys put them both into service to test, I didn't know, and that is what was causing the issues.  The wierd thing is that none of my RPC over HTTPS clients were effected only my iPhones and Windows Mobile.  Thanks for all the suggestions, but once I turned the iSCSI service off and disabled the new network card everything synched without any problems.

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