howto not have log from pam_unix with ldap

[loux.thefuture]

Hello,
i'm using ldap to authenticate users, it works well,
but i have a lot of log in my messages file due to pam_unix something like
...(pam_unix) ...: check pass; user unkown
...(pam_unix) ...: authentication failure, logname=...
my question is : how not to have this log generate ?
Loux
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[pjp]

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