[Dovecot] Authentication failed (migrate from 2.0.13 to 2.0.17)

[Dovecot user]

Hi, 

I use OpenBSD 5.1, roundcube 0.7.2 and dovecot 2.0.17
(684381041dc4+), mysql.

I get the following error when i try to connect
to imap : 

roundcube: IMAP Error: Login failed for testing at mydomain.net
from 192.168.0.92. AUTHENTICATE PLAIN: Authentication failed. in
/var/www/webmail/roundcubemail-0.7.2/program/include/rcube_imap.php on
line 205 (POST /webmail/?_task=login&_action=login) 

dovecot:
imap-login: Aborted login (auth failed, 1 attempts): user=,
method=CRAM-MD5, rip=127.0.0.1, lip=127.0.0.1, TLS
Jul 2 15:19:13 mx
dovecot: auth-worker: mysql(localhost): Connected to database mail
Jul 2
15:19:15 mx dovecot: imap-login: Aborted login (auth failed, 1
attempts): user=, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured


Can you help me please ? 

Here my config files :


*dovecot-sql.conf
driver = mysql
connect = host=localhost dbname=mail
user=postfix password=postfix
default_pass_scheme = PLAIN
password_query
= SELECT email as user, password FROM users WHERE email =
'%u'
user_query = SELECT id as uid, id as gid, home,
concat('*:storage=', quota, 'M') AS quota_rule FROM users WHERE email =
'%u' 

*dovecot.conf
#i use this on OpenBSD 5.0 and dovecot 2.0.13,
works, but it doesn't seem to work with this version :-(
# 2.0.13:
/etc/dovecot/dovecot.conf
# OS: OpenBSD 5.0 i386 ffs
auth_mechanisms =
plain login digest-md5 cram-md5 apop
auth_debug=yes
base_dir =
/var/dovecot/
first_valid_uid = 1000
mail_location =
maildir:/var/mailserv/mail/%d/%n
mmap_disable = yes
passdb {
 args =
/etc/dovecot-sql.conf
 driver = sql
}
plugin {
 antispam_mail_notspam =
--ham
 antispam_mail_sendmail = /usr/local/bin/sa-learn

antispam_mail_sendmail_args = --username=%u
 antispam_mail_spam =
--spam
 antispam_mail_tmpdir = /tmp
 antispam_signature = X-Spam-Flag

antispam_signature_missing = move
 antispam_spam =
SPAM;Spam;spam;Junk;junk
 antispam_trash = trash;Trash;Deleted Items;
Deleted Messages
 autocreate = Trash
 autocreate2 = Spam
 autocreate3 =
Sent
 autocreate4 = Drafts
 autosubscribe = Trash
 autosubscribe2 =
Spam
 autosubscribe3 = Sent
 autosubscribe4 = Drafts
 quota = maildir

quota_rule = *:storage=5G
 quota_rule2 = Trash:storage=+100M

quota_warning = storage=95%% /usr/local/bin/quota-warning.sh 95

quota_warning2 = storage=80%% /usr/local/bin/quota-warning.sh 80
 sieve
= ~/.dovecot.sieve
 sieve_dir = ~/sieve
}
protocols = imap sieve
pop3
service auth {
 unix_listener /var/run/dovecot-auth-master {
 group
= _dovecot
 mode = 0666
 user = _dovecot
 }

 unix_listener
/var/spool/postfix/private/auth {
 group = _postfix
 mode = 0660
 user =
_postfix
 }

}

service imap-login {
 service_count = 0
 #user =
_dovecot
 vsz_limit = 64 M
}
service pop3-login {
 service_count = 0

#user = _dovecot
 vsz_limit = 64 M
}
ssl_cert =ssl_cipher_list =
HIGH:MEDIUM:+TLSv1:!SSLv2:+SSLv3
ssl_key =
userdb {
 args =
/etc/dovecot-sql.conf
 driver = sql
}

#userdb {
# driver =
passwd
#}

protocol imap {
 imap_client_workarounds = delay-newmail

mail_plugins = quota imap_quota autocreate
}
protocol pop3 {

mail_plugins = quota
 pop3_client_workarounds = outlook-no-nuls
oe-ns-eoh
 pop3_uidl_format = %08Xv%08Xu
}
protocol lda {

auth_socket_path = /var/run/dovecot-auth-master
 mail_plugins =
$mail_plugins sieve
 postmaster_address = postmaster at mx.itdebug.net

sendmail_path = /usr/sbin/sendmail
}

default_login_user =
_dovenull
default_internal_user = _dovecot

##
## ManageSieve specific
settings
##

# Service definitions
service managesieve-login {

inet_listener sieve {
 port = 4190
 }

 inet_listener sieve_deprecated
{
 port = 2000
 }
}

service managesieve {
 #Max. number of ManageSieve
processes (connections)
 #process_count = 1024
}

# Service
configuration
protocol sieve {
}

Thank you very much. 

--
Wesley