problem z logowaniem do roundcube Opcje

[Swirek]

Witam

mam problem z logowaniem do roundcube

po ustawieniu imap_debug w pliku main.inc.php w logach ujrzałem

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Jun 25 17:55:03 roundcube: S: * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE STARTTLS AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
Jun 25 17:55:03 roundcube: C: A0001 ID ("name" "Roundcube Webmail" "version" "0.5.4" "php" "5.3.3-7+squeeze3" "os" "Linux" "command" "/roundcube/")
Jun 25 17:55:03 roundcube: S: * ID NIL
Jun 25 17:55:03 roundcube: S: A0001 OK ID completed.
Jun 25 17:55:03 roundcube: C: A0002 AUTHENTICATE PLAIN enViaWtAYXJhbWVkaWNhLnBsAHp1YmlrQGFyYW1lZGljYS5wbABwYXz
Jun 25 17:55:07 roundcube: S: A0002 NO [AUTHENTICATIONFAILED] Authentication failed.
Jun 25 17:55:07 roundcube: C: A0003 LOGOUT
Jun 25 17:55:12 roundcube: S: * BYE Logging out
Jun 25 17:55:12 roundcube: S: A0003 OK Logout completed.
Jun 25 17:55:12 roundcube: IMAP Error: Login failed for admin@domena.pl from 188.137.72.26. AUTHENTICATE PLAIN: Authentication failed. in /usr/share/apache2/roundcubemail-0.5.4/program/include/rcube_imap.php on line 192 (POST /roundcube/?_task=login&_action=login)
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kawałek configa

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$rcmail_config['default_host'] = "127.0.0.1";
$rcmail_config['default_port'] = 143;
$rcmail_config['imap_auth_type'] = plain;
$rcmail_config['imap_delimiter'] = "/";
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po łączeniu się poprzez telnet

[PHP] pobierz, plaintext 
 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE STARTTLS AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
[PHP] pobierz, plaintext 

bardzo proszę o jakąkolwiek pomoc bo już kilka godzin z tym walcze
serwer (VPS) stoi na debianie 6.0
jeżeli podać coś jeszcze co by mogło ułatwić sprawę to wrzuce jak najszybciej