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Exchange Calendar Syncs to iPhone in only ONE direction

Posted on 2009-03-30
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Last Modified: 2012-06-22
Hey Guys:

Recently a strange situation w/ my mobile users that use iPhones with our Exchange Server.  Setup is Exchange 2003 SP2 using Exchange ActiveSync to sync w/ iphones remotely.  Recently, calendar syncing is only working in one direction (mobile to server).  That is, if a calendar event is created on the phone, it syncs properly back to Exchange.  It is not working in the other direction (i.e. if a calendar event is created in outlook, it never gets synced out to the mobile device).  This has just popped up recently.  All other items (mail and contacts) are syncing correctly still.  

Any suggestions?
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Question by:zagnutttt4
18 Comments
 
LVL 17

Expert Comment

by:JohnGerhardt
ID: 24020598
I think we should start off by confirming that the iPhone is on the latest firmware and if not updating it...
If it is on the latest then delete the exchange account and readd it...
If it still doesn't work then post back...
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Author Comment

by:zagnutttt4
ID: 24020622
Hi John:

The devices are all running the latest firmware and also I've tried multiple times to completely remove the Exchange Account from the device and re-add it.  Each time I delete and re-add, same thing happens:  All mail and contacts instantly sync up correctly.  Nothing syncs from Exchange calendar to mobile device calendar.  Interestingly enough, if I create an event on the mobile device, it will appear in outlook, and if I DELETE the event in outlook it will delete it on the mobiles.  However, still no syncing outbound other than that.
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LVL 17

Expert Comment

by:JohnGerhardt
ID: 24020722
Have you tried syncing the phone with a different account to rule out a problem with exchange for that user...?
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Author Comment

by:zagnutttt4
ID: 24020739
Yep - there are 3 different iphones.  I've tried synching each of them with multiple exchange accounts on my server.  Each time, same calendar problem!!
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JohnGerhardt earned 500 total points
ID: 24020774
Ok well that rules out the obvious...!
Can you try an Active sync test for me on http://www.testexchangeconnectivity.com?
 
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Author Comment

by:zagnutttt4
ID: 24020885
The test fails because I do not use SSL
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LVL 17

Expert Comment

by:JohnGerhardt
ID: 24020920
Can I ask why you aren't running it over SSL.. without SSL HTTP will send data in plain text..
Certificates will not cost more than $40 and are simple to install.. I would highly recommend it... Unless you are running a VPN solution...
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Author Comment

by:zagnutttt4
ID: 24020939
I understand the risks of running the credentials over plain HTTP without SSL.  I actually have a cert to install soon and switch over to 443.

We do run a VPN to mobile Outlook users, but for now - just straight HTTP for the mobile iphone users.  But in any case - any more ideas on the calendar situation?
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LVL 17

Expert Comment

by:JohnGerhardt
ID: 24020956
Err thinking about the calendar issue..! good news about the SSL.. ;)
Sorry for deviating off topic, just thought I would ask..!
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Author Comment

by:zagnutttt4
ID: 24020970
Fully understood!!  
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LVL 17

Expert Comment

by:JohnGerhardt
ID: 24020983
Ok now just to confirm that it isn't..
Can you confirm that there isn't more that one calendar in Outlook. If this is the case then it could be that the iPhone's default calendar is set to the wrong one and in Outlook you then dont see it...
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Author Comment

by:zagnutttt4
ID: 24020998
Yep, only one calendar
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LVL 17

Expert Comment

by:JohnGerhardt
ID: 24021652
Ok - I am really not sure about this..
Have a look @ http://www.experts-exchange.com/Hardware/Handhelds_-_PDAs/Blackberry/Q_23283198.html
I know it is about a BB but it might be of help..
Clustching at straws though.. Still thinking..!
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Author Comment

by:zagnutttt4
ID: 24021698
interesting..  We never had any problems when we were using Blackberries with BES. Hmm...
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LVL 17

Expert Comment

by:JohnGerhardt
ID: 24071309
Have you had any progress...?
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Author Comment

by:zagnutttt4
ID: 24087451
Hi John:

Sorry for my delayed reply on this.  I was actually able to resolve this problem by modifying some settings on our firewall in combination with changing some bogus settings on one of our web-filtering appliances.  So technically, the problem apparently had nothing to do w/ ActiveSync!!  I do thank you for your help with this and I will award the points as well.

Thanks again!!
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Expert Comment

by:219com
ID: 24306741
Can you elaborate on what changes you made to your firewall?  I am having the same issue and cannot resolve?
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Expert Comment

by:joewilson00
ID: 24866046
right, what settings?
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