We are having big problems just with this particular adapter in our environment. We are getting intermittent dropouts. The connection will freeze and stop responding to the point where you have to do a windows repair or restart the adapter to get it working again. You can be connected for a whole day with no issues or it could happen at random eg after 20 mins of being connected. Other devices in close proximity e.g. an intel 5100 and 5300 agn are working perfectly.
You get no indication that the connection has dropped and the adapter in the systray looks as if it is still transmitting packets but not recieving any. Cisco WCS troubleshoot indicates no problems. Events in the debug stop and dont start again until you do a repair on the machine.
Intel and Lenovo support have been really unhelpful (they basically don't want to know, apalling service), so now i am turning to Cisco just in case its a configuration issue, which i don't believe it is as we have no reported issues at all with other clients.
On the machine sides we have:
Lenovo x220 Tablet with Intel Centrino Advanced-N 6205 mini pci-e adapter.
Also happening with Fujitsu T730 tablets also with with Intel Centrino Advanced-N 6205 mini pci-e adapters
We have tried all intel driver versions from the latest 126.96.36.199 down to the OEM versions supplied.
they are running Windows XP SP3. We have also tried it with Windows 7 and get similar issues.
We are using Windows Wireless Zero Configuration, WPA2-AES with PEAP and machine (computer) authentication against Cisco ACS v5.2 talking to AD.
On the Wireless infrastructure side we have:
Cisco 1142N (-E-K9) APs connected to 3750G w/poe stacks
The controller is a 3750G-24-WS-50 model running version 188.8.131.52
managed by WCS.
The wireless has 20mhz channels on 1,6,11 on the 2.4ghz side (N is disabled) but we do have N enabled with 40mhz channels on the 5ghz with all UK country channels.
The machines connect at up to 300mb/s and signal quality is excellent. AP density is quite high in the room. DCA, TPC and Tx power control are enabled and set to automatic.
Can't think of more detail to include but I would appreciate any ideas anyone may have.
I wanted to shed some light on this topic. We are aware of an issue with connection dropouts on the Intel 6205 specifically. The issue will be resolved in the 15.1 Intel drivers. The root cause has to do with a failure to ack a packet when Infrastructure MFP is enabled, so the current workaround is to disable infrastructure MFP.
If you can, please try disabling Infrastructure MFP and test the client connectivity.
-config wps mfp infrastructure disable