IPhone 4S with iOS 6 can't connect to open Wi-Fi network on HP/H3C WX5004 controller

After upgrading from iOS 5.1.1 to iOS 6, iPhone 4S devices can no longer connect to an open wi-fi network on our campus.
We have a controller based WLAN from HP/H3C managed by a WX5004 controller with AP models WA2620-AGN and WA2620E-AGN.
Symptom: In the Wi-Fi dialog on the iPhone, out open campus network with SSID "CampusUniPassau" is displayed. After tapping this SSID, the iPhone tries to connect for a few seconds and then displays the error message 'Unable to join the network "CampusUniPassau'.
Our WLAN controller logs the following errors:
*Sep 21 08:40:46:336 2012 ac1 WMAC/7/ERROR : Invalid Extended Capabilities IE length (4).
*Sep 21 08:40:46:336 2012 ac1 WMAC/7/ERROR :  Error while processing information elements
#Sep 21 08:40:46:652 2012 ac1 WMAC/4/Station Association Fail: Station Assoc Fail:1.3.6.1.4.1.2011.10.2.75.3.2.0.4<h3cDot11StationAssocFailTrap> StaMac1:68:A8:6D:87:XX:XX StaMac2:68:A8:6D:87:XX:XX StaMac3:68:A8:6D:87:XX:XX Radioid:2 SSIDName:CampusUniPassau Cause:1 Desc:Unknown Failure APID:210235A42MB102000054
With iOS 5.1.1, all worked well, so this should be an iOS 6 bug. Are there any workarounds until Apple releases a bug fix?
Thanks in advance for any advice,
   Christian

HI,
i am affected by this problem myself. We are also using the H3C WX5004 with WA2620AGN accesspoints.
Today I got update from H3C and got a new firmware to download.
HEre is the description:
The issue of the extended capabilities should be address in 5.20R2308P07  ftp  link below for the WX5004
The issue was as described below :
(1)           R2308P06 does not support Extended Capabilities (IE) which is contained in association request from the IPAD 3 IOS6, as below. This has been fixed by  the R2308P07 code.
Regards
Florian

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