[Dovecot] Errors in dovecot 1 beta7

[Oliver Schulze L.]

Hi,
I just installed dovecot 1.0 beta 7 and I have these errors:

May  5 09:21:27 mail dovecot: pop3-login: Login: user=<user1>, 
method=PLAIN, rip=::ffff:xx.xx.xx.6, lip=::ffff:xx.xx.xx.1
May  5 09:21:27 mail dovecot: POP3(user2): Disconnected: Logged out 
top=0/0, retr=0/0, del=0/0, size=0
May  5 09:21:27 mail dovecot: pop3-login: Login: user=<user3>, 
method=PLAIN, rip=::ffff:xx.xx.xx.12, lip=::ffff:xx.xx.xx.1
May  5 09:21:27 mail dovecot: auth(default): 
userdb(user4,::ffff:xx.xx.xx.207): user not found from userdb
May  5 09:21:27 mail dovecot: pop3-login: Internal login failure: 
user=<user4>, method=PLAIN, rip=::ffff:xx.xx.xx.207, lip=::ffff:xx.xx.xx.1
May  5 09:21:27 mail dovecot: POP3(user1): Disconnected: Logged out 
top=0/0, retr=0/0, del=0/0, size=0


May  5 09:36:49 mail dovecot: pop3-login: Login: user=<user5>, 
method=PLAIN, rip=::ffff:xx.xx.xx.203, lip=::ffff:xx.xx.xx.1
May  5 09:36:49 mail dovecot: POP3(user5): Disconnected: Logged out 
top=0/0, retr=0/0, del=0/0, size=0
May  5 09:36:50 mail dovecot: auth(default): BROKEN NSS IMPLEMENTATION: 
getpwnam() lookup returned different user than was requested (user6 != 
user7).
May  5 09:36:50 mail dovecot: child 8454 (auth) returned error 89
May  5 09:37:50 mail dovecot: pop3-login: Disconnected: Inactivity: 
user=<user7>, method=PLAIN, rip=::ffff:xx.xx.xx.32, lip=::ffff:xx.xx.xx.1

I run dovecot in CentOS 4.3 using openldap/nss_ldap/nscd

The problem get resolved when I restart dovecot. Is this a problem in 
dovecot or in nss_ldap/nscd?
How can I debug even further?

Many thanks
Oliver

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