[Dovecot] check pass; user unknown in logs

[james edwards]

I am seeing lots of these in my logs and there are often a hundered or so
imap/dovecat process running.
I am running RC Core3. Can anyone shead some light on how to correct this ?

Jun 16 08:38:24 jidmail dovecot(pam_unix)[27653]: check pass; user unknown
Jun 16 08:38:24 jidmail dovecot(pam_unix)[27653]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 16 08:38:24 jidmail dovecot(pam_unix)[27657]: check pass; user unknown
Jun 16 08:38:24 jidmail dovecot(pam_unix)[27657]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 16 08:38:24 jidmail dovecot(pam_unix)[27658]: check pass; user unknown
Jun 16 08:38:24 jidmail dovecot(pam_unix)[27658]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 16 08:38:26 jidmail dovecot(pam_unix)[27684]: check pass; user unknown
Jun 16 08:38:26 jidmail dovecot(pam_unix)[27684]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 16 08:38:27 jidmail dovecot(pam_unix)[27690]: check pass; user unknown
Jun 16 08:38:27 jidmail dovecot(pam_unix)[27690]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 16 08:38:27 jidmail dovecot(pam_unix)[27693]: check pass; user unknown
Jun 16 08:38:27 jidmail dovecot(pam_unix)[27693]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 16 08:38:29 jidmail dovecot(pam_unix)[27712]: check pass; user unknown
Jun 16 08:38:29 jidmail dovecot(pam_unix)[27712]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 16 08:38:30 jidmail dovecot(pam_unix)[27713]: check pass; user unknown
Jun 16 08:38:30 jidmail dovecot(pam_unix)[27713]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 16 08:38:30 jidmail dovecot(pam_unix)[27716]: check pass; user unknown
Jun 16 08:38:30 jidmail dovecot(pam_unix)[27716]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=

-- 
James H. Edwards
Network Systems Administrator
Judicial Information Division
jedwards at nmcourts.com
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