If your anchoring through a FW, then I would check to see if something is happening with the FW. Not that the FW is down, just to see if you see packets being dropped. If your internal WLC's mobility is rock solid and only your mobility anchors to your dmz wlc is being affected, I would look at what's in between. I had a co-worker who had an issue with some non Cisco FW and the FW was the culprit in the same scenario you are seeing. I don't know if there was a fix or not as it was a while ago.
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
This is the start of a display filter cross reference between Wireshark and OmniPeek.
The 1st installment is a table of advanced filters. More filters will be added as time allows.
It is a living doc, so check back for changes every so often
Please feel ...
I have created a Powershell script to automatically add a Wireless Guest User on Cisco WLCs. (tested on 2500 Series)
The script should be completely self explanatory.
Powershell SNMP Module (Install-Module -Name SNMP)
SNMP Write Access to...