Skip navigation
Login   |   Register
Cisco Learning Home > Certifications > Wireless (CCNP Wireless) > Discussions


1177 Views 3 Replies Latest reply: Apr 25, 2012 5:19 AM by Jason B RSS

Currently Being Moderated

WLC 4400: apple devices, icloud problem

Apr 23, 2012 1:46 AM

Anton 4 posts since
Feb 10, 2010

Good day!

We have problems with our apple devices using the icloud service.

During the icloud backup process over wifi, the connection is flapping and backup process restarts.

The signal strength is good, coverage is strong, LAPs are situated not very far from the client (<10m)

802.11n is disabled

all other devices/vendors and services works fine



we are using the floowing equipment:





what can cause such kind of problem?

May be there is some secret solutions or settings on the WLC



Thank you!

  • Jason B 184 posts since
    Nov 16, 2008
    Currently Being Moderated
    1. Apr 23, 2012 6:43 AM (in response to Anton)
    Re: WLC 4400: apple devices, icloud problem

    Could you provide the following in order to allow us to better help you:


    1) What firmware version are you running on the WLC?

    2) What type of security are you running (WPA2-Enterprise, WPA2-PSK, open, etc.)?

    3) Are only Apple devices affected in terms of connectivity?

    4) If you are using WPA2-Enterprise, what type of authentication are you using (PEAPv0-MSCHAPv2, EAP-TLS, etc.)?

    5) Is this happening on both the 2.4GHz and 5GHz bands?

    6) Is there a reason why you disabled 802.11n?

    7) Have you ruled out a non-802.11 interferer in the area?

    8) Have you upgraded the firmware version of the clients?


    As you can see, there are a ton of factors that could be leading to this issue, and more than I've listed.  We need more information to provide better help.

    Join this discussion now: Login / Register
  • Jason B 184 posts since
    Nov 16, 2008
    Currently Being Moderated
    3. Apr 25, 2012 5:19 AM (in response to Anton)
    Re: WLC 4400: apple devices, icloud problem



    Thanks for the responses.  I would recommend upgrading to  I don't see anything in the release notes that would impact your situation, so that's just a general recommendation as it contains fixes for other things.  I'm not aware of compatibility issues with 802.11n and Apple devices.  We've had all types of Apple devices on our network, running WPA2-PSK/AES and 802.11n.


    One thing I did have to do at one point was to uncheck "Enable Aironet IE" under the WLAN Advanced tab.  We had a couple of Apple devices that would not connect properly with that enabled.


    As for the office, are there other companies' offices around yours?  It's possible that they are causing enough interferance with yours to cause the drops.  I'd use something like inSSIDer or Netstumbler to see what other 802.11 networks are around you.  In particular, see if any are operating on a channel other than 1, 6, or 11.  That can really mess things up for your network if they are. 


    iCloud uses a unicast stream, so no need to enable multicast.

    Join this discussion now: Login / Register


More Like This

  • Retrieving data ...

Bookmarked By (1)