new wireless lan controller keeps failing rdius authentication with errors like this
RADIUS server 10.x.x.x:1645 deactivated in global list
RADIUS server 10.x.x.x:1645 failed to respond to request (ID 65) for client 00:0b:6b:87:54:d2 /user ‘unknown’
the problem is 2 fold the cisco wireless lan controller radius configuration defaults to a time out of 2 seconds.
you can find this in security/radius/authentication/and your server
change that to 20 seconds
save your configuration
now ssh into the controller using putty or some other app.
run the following command
config radius aggressive-failover disable’
save your configuration and reboot the controller and you should have no more troubles with the radius authentication.