CentOS 5 - locking out users afer 3 failed attempts

[Tom Brown <tom@xxxxxxxx>]

Hi

I am trying to lock users after 3 attempts and then set the timeout
before they can log in again.
I thought i could achieve this with

auth required pam_tally.so deny=3 unlock_time=600

in /etc/pam.d/system-auth but it seems to not be the case - I cant
find a working config for this anywhere and i wonder if anyone has one
they can share?

thanks
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