I'm facing a troublesome problem with one of our deployments.
We find that some of the utilized iPads (iPad2, iOS 5) have a significant delay to connect to the WiFi after waking up.. though some of them show the WiFi-icon instantly after wake-up.. That is causing the crestron App on it to "malfunction", which is to say that it can't connect to it's server and goes back to home screen to allow re-connect..
WLC and LAPs using the latest software (22.214.171.124).. encryption is WPA2/PSK..
I've searched all over the internet for clues.. found many things that seemed to have worked for others, but not for me/us..
I found this posting on CSC: https://supportforums.cisco.com/thread/2109205 but the changes (I had an ACL to deny internet access) had no effect..
I changed the WLAN to use 802.11g only.. changed Beacon-Time.. changed encyption.. changed WMM settings..
Alas, the iPads that expose this behaviour do not show any difference with the changes..
Did anyone else experience the problem had found a solution? I would be very grateful if you could share & advice..