WPA2-enterprise WIFI can't connect after upgrading to 6.1 or higher

Hi. Please help.
We have a campus wifi with two ssids: one open for everyone and one closed with wpa2-enterprise (PEAP) security for staff. All iphones and ipads works just fine on ios version 6.01 but they can't connect to secured wifi network after updating to ios ver 6.1 and higher (tried 6.1.2). They still able to connect to open wlan ssid. Our WIFI equipment is: Extremenetworks WM3600 controllers and AP4600/AP4511 access points running WM5.4.1. WMM enabled.
WM3600 controller use Windows2008 r2 NPS server + active directory for authorization (selfsigned certificates is 2048 bit length).
WM3600 wlan staff configuration settings:
wlan Staff
description TOGU staff network
ssid STAFF
vlan 238
bridging-mode tunnel
encryption-type tkip-ccmp
authentication-type eap
no answer-broadcast-probes
protected-mgmt-frames optional
radius vlan-assignment
no motorola-extensions symbol-load-information
use aaa-policy Domain_aaa
Here is the log from iphone configuration utility with connection error:
Feb 20 17:18:00 kernel[0] <Debug>: en0::IO80211Interface::postMessage bssid changed
Feb 20 17:18:00 Preferences[132] <Warning>: -[VPNConnectionStore reloadVPN]: The active VPN configuration has changed from to (null)
Feb 20 17:18:00 Preferences[132] <Warning>: -[VPNBundleController _vpnConfigurationChanged:] (0x1edbea10:<VPNBundleController: 0x1edbea10>): _serviceCount(0), serviceCount(0), toggleInRootMenu(0), RootMenuItem(1)
Feb 20 17:18:00 wifid[14] <Error>: WiFi:[383033880.387575]: Failed to associate with STAFF: -3900
Hope to get any help.

Yes. We tried to reboot iphone(s), tried also with ipads 6.1. We tried to reset network settings.
We tried to add wifi profile to clean new iphone using iphone configuration utility.
Wireless supplier can't help - they told it is an ios issue and I think this is true because all
ipads/iphones works just fine on ios5 or 6.0.1 but can't connect on 6.1

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Message was edited by: erockdabass
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WPA2-enterprise WIFI can't connect after upgrading to 6.1 or higher

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