NAS ignoring Access-Accept

[Wolfgang Rosenauer]

tnt at kalik.co.yu wrote:
> Run debug radius on Cisco. You are missing a key (shared secret) in
> radius-server host ... statement. See if that is the problem.

The shared secret is in another config line which I've left out.
radius-server key XXXXXXXXXX

How can I get debug output on a Cisco? (I'm not really too familiar with
IOS and that is old 11.3)

Wolfgang