[Dovecot] dovecot 2.1.15 hangs while connecting.

[Albert Whale]

I am using Dovecot in two  Server environments.  My Legacy (5 years+ 
old) servers are running dovecot 1.1.20, and are responding as 
expected.  These servers are using an NFS based storage for the /home 
directory structure, and are working beautifully.  However, I need to 
replace these inefficient servers, and get more current.

That brings me to the problem, where I am implementing Dovecot 2.1.15, 
which does not complete the authentication cycle.  I have converted the 
1.1.20 configuration using the documentation available, and I have the 
following for my running configuration (which is not working):

# 2.1.15: /etc/dovecot/dovecot.conf
# OS: Linux 3.8.13.4-server-1.mga3 i686 Mageia 3
auth_debug = yes
base_dir = /var/run/dovecot/
disable_plaintext_auth = no
lock_method = dotlock
login_greeting = SpamZapper Email ready.
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l %c
mail_debug = yes
mail_fsync = always
mail_location = maildir:~/Maildir
mail_nfs_index = yes
mail_nfs_storage = yes
mail_privileged_group = mail
mmap_disable = yes
passdb {
   driver = pam
}
protocols = imap pop3
service auth {
   user = root
}
service imap-login {
   chroot = login
   client_limit = 256
   user = dovecot
}
service pop3-login {
   chroot = login
   client_limit = 256
   user = dovecot
}
ssl = no
userdb {
   driver = passwd
}
verbose_proctitle = yes
protocol pop3 {
   mail_max_userip_connections = 50
   pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s
   pop3_uidl_format = %08Xv%08Xu
}
protocol lda {
   postmaster_address = postmaster at example.com
}

I have captured the Debug output of the dovecot process while attempting 
to connect:

May 27 13:02:10 ns dovecot: auth: Debug: client in: 
AUTH#0111#011PLAIN#011service=pop3#011session=IzAYqGT6pgBCz4Xk#011lip=66.207.133.227#011rip=66.207.133.228#011lport=110#011rport=38566#011resp=<hidden>
May 27 13:02:10 ns dovecot: auth-worker(551): Debug: Loading modules 
from directory: /usr/lib/dovecot/modules/auth
May 27 13:02:10 ns dovecot: auth-worker(551): Debug: Module loaded: 
/usr/lib/dovecot/modules/auth/libdriver_mysql.so
May 27 13:02:10 ns dovecot: auth-worker(551): Debug: 
pam(aewhale,66.207.133.228): lookup service=dovecot
May 27 13:02:10 ns dovecot: auth-worker(551): Debug: 
pam(aewhale,66.207.133.228): #1/1 style=1 msg=Password:
May 27 13:02:10 ns dovecot: auth: Debug: client passdb out: 
OK#0111#011user=aewhale
May 27 13:02:10 ns dovecot: auth: Debug: master in: 
REQUEST#0112671116289#011453#0111#01174d85bf0d878139a83e682a869786da9
May 27 13:02:10 ns dovecot: auth-worker(551): Debug: 
passwd(aewhale,66.207.133.228): lookup
May 27 13:02:10 ns dovecot: auth: Debug: master userdb out: 
USER#0112671116289#011aewhale#011system_groups_user=aewhale#011uid=501#011gid=501#011home=/home/aewhale
May 27 13:02:10 ns dovecot: pop3-login: Login: user=<aewhale>, 
method=PLAIN, rip=66.207.133.228, lip=66.207.133.227
May 27 13:02:10 ns dovecot: pop3(aewhale): Debug: Effective uid=501, 
gid=501, home=/home/aewhale
May 27 13:02:10 ns dovecot: pop3(aewhale): Debug: maildir++: 
root=/home/aewhale/Maildir, index=, control=, 
inbox=/home/aewhale/Maildir, alt=

All processing stops here.

This is an NFS Storage Mail Spool, which works on 1.1.20 but not 
2.1.15?  What other pink elephants have I missed?

Thank you for your assistance.




-- 
Albert E. Whale, CEH CHS CISA CISSP
*President - Chief Security Officer*
http://www.IT-Security-inc.com - IT Security, Inc.


Phone: 412-515-3010 | Email: Albert.Whale at IT-Security-inc.com
Cell: 412-889-6870