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I had the same problem when i installed new router in branch.
I used Loopback interface for radius connection:
ip radius source-interface Loopback0
But ip address of this Loopback was routed for radius server in the different path.
Check available r...
Controller-> General-> User Idle Timeout (seconds) = 50 000 sec. And your users will be connected all this time even if they going in sleepmodebe carefull with CPU loading
