Why are false authentication failure messages reported by pam_unix for ldap users in Red Hat Enterprise Linux?

Updated -

Release Found: Red Hat Enterprise Linux, all version

Problem

pam_unix produces the below error when a user is being successfully validated in an LDAP environment. Is there some way to disable the false error messages in this environment while still logging real authentication failure messages?

dhcp6-115 sshd(pam_unix)[5601]: authentication failur...

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