This message occours when a wireless client is out of range of the associated access point. This can be caused by radio interference disrupting the signal and causing blackspots, however it can also be caused simply because the network does not cover where the client is. If the client is roaming, depending on the architecture your using, you will either see an associate message from the next access point, or a 'roamed to' message.
To be certain, use the Site Survey tool and follow the client, check to see if the signal suddenly degrades (indicating interference) or if it gradualy degrades then drops out (indicating poor coverage).
Other possible causes could be that the two access points are using channels that are to close to each other (eg AP1 uses channel 11, and AP2 uses channel 10). Try and make adjacent access points use channels as far apart as possible (eg 1, 7, 11).
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
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 f...
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. Prerequisites: Powershell SNMP Module
(Install-Module -Name SNMP) SNMP Write Access to y...