[tac_plus] How do I enable logging of failed login attempts to the accounting log ?

[Tom Mccormack]

Hi,

How do I enable logging of failed login attempts to the accounting log ?

Ive read that unless the network access server (NAS) is configured to do so, failed login attempts are not logged to the accounting server but I cant find what I need to do to enable this.

On my Cisco router I added the command 

aaa accounting send stop-record authentication failure

Rgds