We've recently deployed an express wireless configuration involving a 526WLC and 5 AP521s at a customer's site. The wireless system work fantastically well with one exception -- it does not play well with Apple mobile devices. This includes iPhones and iPod Touches.
What happens is when the mobile device in question attempts to connect, the connection simply fails. It will stall for a minute and error out saying it was unable to connect. I've tried several different types of security from WEP to WPA to WPA2 to no security at all! -- no avail.
The only pattern that I've seen is that older version'd devices (1st iPhones, 1st Gen iPod touches, etc) are able to connect just fine. My iPhone 3G S as well as newer iPod touches seem to fail.
Has anyone experienced a similar issue or have any insight as to what may be going on? Any help is much appreciated