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Apple iOS4 Crashing Exchange Servers

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Posted 07-01-2010 at 12:29 AM by Otto

Okay, admittedly, this is not a BlackBerry-related post, but it is useful for Exchange engineers all the same.

iOS 4: Exchange Mail, Contacts, or Calendars may not sync after update

It seems that Apple's recent release of iOS4 and the "revolutionary" iPhone 4 has caused a "small" problem for enterprises running Exchange. In essence, the iOS4-based device becomes a drone in a DDoS attack against the Exchange mail servers. This has caused the Exchange servers to exhaust resources and ultimately crash, in some (most?) cases.

There is a client-based fix. Of course, this is only as good as your ability to enforce the installation. For all of you administrators and IT shops that allow iPhone and iPod Touch mobile devices on your Exchange server via ActiveSync, be sure to distribute this update to your users. Also, if you have a means (creative or not) of validating the patch was actually installed on the devices and possibly a means to enforce it, feel free to respond to this blog post.
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Total Comments 7


  1. Old Comment
    I guess it crashed your front-end servers and not your mailbox servers. Right?
    Posted 07-01-2010 at 05:05 AM by Abe Abe is offline
  2. Old Comment
    Otto's Avatar
    It is actually causing resource issues on the backend servers. The impact to the frontend servers (FES or CAS) is minimal, from what I've read.
    Posted 07-01-2010 at 06:29 AM by Otto Otto is offline
  3. Old Comment
    Cheese Sammich's Avatar
    We only have ONE iPhone user on our Exchange server, and he upgraded to OS4. Just as described in the Apple KB article, he immediately started having sync issues and my Exchange Server took a crap. One user caused a crash. What a nightmare this must be for larger organizations.
    Posted 07-01-2010 at 08:02 AM by Cheese Sammich Cheese Sammich is offline
  4. Old Comment
    Joolie's Avatar
    That's just freaking great. Yet another #FAIL on Apple's part.
    Posted 07-01-2010 at 08:21 AM by Joolie Joolie is offline
  5. Old Comment
    Posted 07-01-2010 at 08:55 PM by hdawg hdawg is offline
  6. Old Comment
    Otto's Avatar
    iOS 4.0.1 was released today and includes the patch in it. Hopefully this will start clearing things up a bit. HOPEFULLY!
    Posted 07-16-2010 at 01:21 AM by Otto Otto is offline
  7. Old Comment
    audit's Avatar
    We have over a dozen iPhone users in our company and the exchange server has been running just fine. All but 1 is running IOS4.
    Posted 07-20-2010 at 12:43 PM by audit audit is offline

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