Apple fixes issue with iOS 4 and Exchange ActiveSync

by Bharat Suneja on June 28, 2010

Apple iPhone 4 with iOS 4Users of Apple’s new iPhone 4 phones or iPhone 3G, 3GS or iPod Touch users who upgraded to iOS 4 have been reporting issues synchronizing to Exchange Server using Exchange ActiveSync (EAS). The issue with Apple’s latest mobile operating system, iOS 4, also results in additional load on Exchange Server, which may cause performance issues on Exchange 2010/2007 Client Access servers. The issue isn’t limited to iPhone connectivity to Exchange Servers, but also extends to Google’s Gmail service, which uses EAS to offer mobile email access.

iOS 4’s default timeout for EAS requests is set to a very low 30 seconds, causing the requests to timeout and resulting in additional requests being made by the iOS 4 device.

Apple has released a configuration update that fixes some of these issues. The Apple kb article states:

Immediately after updating to iOS 4, some users may notice that Exchange ActiveSync Mail, Contacts, or Calendars do not sync, or sync very slowly. In addition, some Exchange Server administrators may notice their servers running slowly.

The update increases the timeout for EAS requests made by iOS 4 devices. In particular, the update modifies the DefaultEASTaskTimeout parameter to 240.0 (240 seconds or 4 minutes). Config files are XML, so you can modify this value to what’s appropriate for your environment— although the 240-second timeout should work for most environments. If you feel it’s inadequate, please share your experience in the comments section.

According to Apple, “the profile should be installed on as many iOS 4 devices at your company as possible.” Head over to iOS 4: Exchange Mail, Contacts, or Calendars may not sync after update on Apple.com to download the config file.

7/15/2010: Apple has released iOS 4.0.1 which includes the configuration change for device timeout.

{ 17 comments… read them below or add one }

Shirl June 28, 2010 at 7:38 pm

Thanks for the update – glad Apple fixed the issue. Are there any other issues with iPhone 4 and Exchange?

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Jeff Sullivan June 28, 2010 at 7:40 pm

We’re still having issues after updating the config!

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Jeff Stevens June 29, 2010 at 7:49 am

We had issues with the 4.0 upgrade. This one wasn’t our problem. We had server config problems. We got ours fixed by TECHNOKOZ. I’m glad we found them

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Christopher June 29, 2010 at 12:45 pm

What was the timeout value in iOS 3.x?

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David July 1, 2010 at 7:17 am

ios3 was 240 seconds

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Lou June 30, 2010 at 3:18 pm

Still not working for me either with the update. Does size of your e-mail account have anything to do with this? I can get my folders and can actually send e-mail from my phone – but I still can’t receive e-mails or see them in my inbox or other folders.

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Lou June 30, 2010 at 3:48 pm

I spoke too soon – after letting the phone sit for about 20-30 minutes it ended up downloading my messages and seems to be working. This might be the fix I needed afterall. Thanks for the posts!

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Mike June 30, 2010 at 5:25 pm

I installed the fix and still cant connect to my exchange server… why did I leave my Bberry!!!!

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Meg On A Trip June 30, 2010 at 8:56 pm

Same here – applied update but no joy yet! Come on Apple, step up and fix the issue! Wish I’d stuck with the 3GS but I do like the iPhone 4, and haven’t noticed any reception issues.

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Jakob July 1, 2010 at 3:55 pm

To all those the say it does not work: Did you REBOOT the PHONE after you installed it (a noted in the kbase!)

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Meg On A Trip July 1, 2010 at 7:30 pm

@Jakob: Yes, rebooted a few times.

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mike July 7, 2010 at 1:01 pm

updated from apple and changes the timout to 640 sec but still not verifying my account. i reboot and tried again and again, anyone else still having a issue?

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figufab July 12, 2010 at 1:44 pm

Same issue for me…downloaded the apparent apple fix. Rebooted the iphone 3Gs with IOS4…and the issue still comes back every so often.

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gran_duque August 24, 2010 at 12:54 am

Exchange 2007 SP3 has a “Fix” that stops Apple Mail from accessing my work Exchange account. Apparently Apple Mail could immitate OWA access, but now this is considered a security risk and has been fixed so I can no longer use my iMAC. Cheers !

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Jewett November 16, 2010 at 2:32 pm
Jewett November 16, 2010 at 2:33 pm

Sorry forgot to mention the sever is exchange 2003 SP2. thanks

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June October 7, 2012 at 1:52 am

Try Pop3, i use this for the meantime Apple has not found fix yet. Better show all the config for the Exchange, maybe that will solve the issue – for the MS Exchange programmers.

Good luck.

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