pam_unix errors

["Oliver Schulze L." <oliver@samera.com.py>]

Hi,
I'm using LDAP 2.0.27 on RedHat 9. I'm also using the nss_ldap-202 module.
The problem I'm getting is that every time a user try to autenticate for 
using pop3
or a shell, I get this error:
Jun 30 09:45:18 myserver pop(pam_unix)[10045]: check pass; user unknown
Jun 30 09:45:18 myserver pop(pam_unix)[10045]: authentication failure; 
logname= uid=0 euid=0 tty= ruser= rhost=
Jun 30 09:45:19 myserver ipop3d[10045]: Login user=user1 
host=pc24.example.com.py [192.168.210.24] nmsgs=0/0
Jun 30 09:45:19 myserver ipop3d[10045]: Logout user=user1 
host=pc24.example.com.py [192.168.210.24] nmsgs=0 ndele=0

Is this a problem with LDAP or PAM? The strange thing is that the error 
is printed from the
same PID. Looks like, first the autenticatio fatils and then succeed.

Many thanks
Oliver

--
Oliver Schulze L.
<oliver@samera.com.py>