[c-nsp] aaa authorization and "authentication expired"

[Per Carlson]

Hi.

> I've set up command authorization using TACACS+ on some devices
> (various IOS releases), and have since experienced a new type of
> "error" message: "Authentication expired". I would like to find more
> information of this time out, and if it's configurable (either on the
> device or  in some AV pair).

Found the cause of this (thanks Javier for a pointer). It turns out
it's the TACACS+ server timing out the session 10 minutes after login.
Fortunately it's a configurable timer.

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Pelle

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