Wrong startup greeting (localhost:143): * BYE Disconnected: Auth process broken)

[iluvuwen]

Hi, at the installation process, my rc is giving me Wrong startup greeting (localhost:143): * BYE Disconnected: Auth process broken) message.
SMTP works okay, but not IMTP.

I use postfix and dovecot on CENTOS 7

these are the settings:
$config['default_host'] = 'localhost';

// TCP port used for IMAP connections
$config['default_port'] = 143;

// IMAP AUTH type (DIGEST-MD5, CRAM-MD5, LOGIN, PLAIN or null to use
// best server supported one)
$config['imap_auth_type'] = null;

-------------------------
auth_mechanisms = plain login cram-md5
------------------------

error log (0.0.233.0 is my ip, domain.net is my site, changed them here for security purposes)

[01-Oct-2014 09:01:33 Asia/Tokyo] $addr cannot be empty ():
[01-Oct-2014 09:01:33 Asia/Tokyo] Failed to connect socket: $addr cannot be empty ():
[01-Oct-2014 09:01:46 Asia/Tokyo] $addr cannot be empty ():
[01-Oct-2014 09:01:46 Asia/Tokyo] Failed to connect socket: $addr cannot be empty ():
[01-Oct-2014 09:04:39 +0900]: IMAP Error: Login failed for admin from 0.0.233.0. Could not connect to localhost:143: Rejected in /var/www/html/imosic.net/public_html/mail/program/lib/Roundcube/rcube_imap.php on line 184 (POST /mail/?_task=login?_task=login&_action=login)
[01-Oct-2014 09:04:46 +0900]: IMAP Error: Login failed for admin from 0.0.233.0. Could not connect to localhost:143: Rejected in /var/www/html/domain.net/public_html/mail/program/lib/Roundcube/rcube_imap.php on line 184 (POST /mail/?_task=login?_task=login&_action=login)
[01-Oct-2014 09:40:49 +0900]: IMAP Error: Login failed for admin from 0.0.233.0. AUTHENTICATE PLAIN: Authentication failed. in /var/www/html/domain.net/public_html/mail/program/lib/Roundcube/rcube_imap.php on line 184 (POST /mail/?_task=login?_task=login&_action=login)
[01-Oct-2014 09:41:20 +0900]: IMAP Error: Login failed for admin from 0.0.233.0. AUTHENTICATE PLAIN: Authentication failed. in /var/www/html/domain.net/public_html/mail/program/lib/Roundcube/rcube_imap.php on line 184 (POST /mail/?_task=login?_task=login&_action=login)
[01-Oct-2014 09:55:20 +0900]: IMAP Error: Login failed for admin from 0.0.233.0. AUTHENTICATE PLAIN: Authentication failed. in /var/www/html/domain.net/public_html/mail/program/lib/Roundcube/rcube_imap.php on line 184 (POST /mail/?_task=login?_task=login&_action=login)
[01-Oct-2014 13:58:11 +0900]: IMAP Error: Login failed for admin from 0.0.233.0. AUTHENTICATE PLAIN: Authentication failed. in /var/www/html/domain.net/public_html/mail/program/lib/Roundcube/rcube_imap.php on line 184 (POST /mail/?_task=login?_task=login&_action=login)




[01-Oct-2014 14:21:08 +0900]: [7401] S: * ID ("name" "Dovecot")
[01-Oct-2014 14:21:08 +0900]: [7401] S: A0001 OK ID completed.
[01-Oct-2014 14:21:08 +0900]: [7401] C: A0002 AUTHENTICATE PLAIN ****** [21]
[01-Oct-2014 14:21:16 +0900]: [7401] S: A0002 NO [AUTHENTICATIONFAILED] Authentication failed.
[01-Oct-2014 14:25:03 +0900]: [F56D] S: * BYE Disconnected: Auth process broken
[01-Oct-2014 14:25:05 +0900]: [E46E] S: * BYE Disconnected: Auth process broken
[01-Oct-2014 14:30:14 +0900]: [6F78] S: * BYE Disconnected: Auth process broken
[01-Oct-2014 14:31:16 +0900]: [5613] S: * BYE Disconnected: Auth process broken