[Dovecot] Problem with Postfix + Dovecot + MySQL + Squirrelmail

[Gustavo]

Dear friends, 

I try configure a webmail on my server using Postfix + Dovecot + MySQL + Squirrelmail. 

My system is a Debian6 and dovecot version is: 

#dovecot --version
1.2.15

But, when I try to access an account on squirrel I recieve this message: 

“ERROR
Error connecting to IMAP server: localhost.
111 : Connection refused”

Looking for a problem I foud this: 

#service dovecot start
Starting IMAP/POP3 mail server: dovecotLast died with error (see error log for more information): Auth process died too early - shutting down
If you have trouble with authentication failures,
enable auth_debug setting. See http://wiki.dovecot.org/WhyDoesItNotWork
This message goes away after the first successful login.
.

And the status of doveco is: 

#service dovecot status
dovecot is not running ... failed!

The other services seems to be OK: 

#service postfix status
postfix is running.

# service mysql status
/usr/bin/mysqladmin  Ver 8.42 Distrib 5.1.49, for debian-linux-gnu on x86_64
Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL license

Server version5.1.49-3
Protocol version10
ConnectionLocalhost via UNIX socket
UNIX socket/var/run/mysqld/mysqld.sock
Uptime:32 days 14 hours 23 min 39 sec

Threads: 1  Questions: 6743  Slow queries: 0  Opens: 385  Flush tables: 1  Open tables: 47  Queries per second avg: 0.2.

Looking at dovecot.conf I found some incosistences: 

On dovecot.conf:

protocol lda {
sendmail_path = /usr/lib/sendmail
auth_socket_path = /var/run/dovecot/auth-master
}

socket listen {
master {
path = /var/run/dovecot/auth-master
mode = 0600
user = vmail 
group = mail
}
client {
path = /var/run/dovecot/auth-client
mode = 0660
user = vmail 
group = mail
}
}

But in the system I don1t found this files!!! 

/var/run/dovecot# ls
total 20K
drwxr-xr-x 3 root root    4.0K Jan 27 11:35 .
drwxr-xr-x 8 root root    4.0K Jan 27 09:33 ..
srw------- 1 root root       0 Jan 27 11:35 auth-worker.26163
srwxrwxrwx 1 root root       0 Jan 27 11:35 dict-server
lrwxrwxrwx 1 root root      25 Jan 27 11:35 dovecot.conf -> /etc/dovecot/dovecot.conf
drwxr-x--- 2 root dovecot 4.0K Jan 27 11:35 login
-rw------- 1 root root      43 Jan 27 11:35 master-fatal.lastlog
-rw------- 1 root root       6 Jan 27 11:35 master.pid

/var/run/dovecot# ls login/
total 12K
drwxr-x--- 2 root dovecot 4.0K Jan 27 11:35 .
drwxr-xr-x 3 root root    4.0K Jan 27 11:35 ..
srw-rw---- 1 root dovecot    0 Jan 27 11:35 default
-rw-r--r-- 2 root root     230 Jan 23 19:12 ssl-parameters.dat

I think maybe that is the problem. Anyone knows how I fix that? Or what is the real problem? 

Thanks for any help!
 
-- 
Gustavo