I've yet to talk to TAC about this as I know they're going to want to test and it's a little hard to test in a live environment but here's my story. Last Friday I had to come into work for a couple of CoW's not connecting and it was very odd. So in troubleshooting I was dinking around with the 4404 controller (5.2.178 code) for that building and looking at settings and made a few changes I'm (sorry not sure what at the time but it was in the WLAN, though nothing related I can guarantee you as you'd have to be an idiot) applied my changes and then I started getting yelled at that all of our carts were dropping connection. They'd attempt to connect but would end up with a Windows error of 'Unable to obtain IP address blah blah'. So I thought it was something to do with DHCP or DHCP settings in the controller. I ended up just shutting that controller down as I couldn't figure it out and was under pressure to get ti back up. The AP's roamed over to my other 4404's and everything worked fine. I left it until today as I was scheduled to go out of town. Well, my two CoW's (carts) were still having problems this morning and I was to look at again.. again, I started doing some testing and holy crap, the same thing happened with my 4404 on 5.2.178 but Controller 2. I took my time this time and looked at the logs and basically was rejecting my authentication so on a whim I decided to copy back in my PSK to the WLAN and walla... they all came back up. AGAIN, nothing was EVER changed with the PSK previously. So what the hell!? Is this a documented bug somewhere? I haven't seen it at all but this is pretty major in my opinion. BTW, WCS version is 220.127.116.11.
Had the same problem with 5.2.178 but that problem has gone since going 18.104.22.168 on controllers and 22.214.171.124 on WCS. The only way to get the wlan working again for us was to re-paste the psk onto each controller individually. A pain as we have 9 controllers and several wlans on each...
It may be the way that WCS stores keys as we had SNMP v3 setup to the controllers and every time we rebooted a controller it would break the connection to WCS.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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