Roundecube Login Problem

Hallo,

i have the Problem i cant Loggin in the Roundecube Webinterface its load all time and than its die.....

Server Info:
Application Version
    Apache version: Apache/2.2.31
    PHP version: 5.6.14
    MySQL version: 10.1.12-MariaDB
    FTP version: 1.0.36

System Info
    Distro Name: CentOS release 6.7 (Final) 

Roundecube Config what i have Chance:
File: db.inc.php
Edit:
From: $rcmail_config['db_dsnw'] = 'mysqli://roundcube:************@localhost/roundcube';
To:  $rcmail_config['db_dsnw'] = 'mysqli://roundcube:**********@127.0.0.1/roundcube';


Update: first error from the Roundecube Log File i have fixed but the next error i dont know ........
Error Log:
[10-Mar-2016 21:00:27 +0100]: IMAP Error: Login failed for support@sons-of-arthrose.com from 93.***.***.***. Unable to send command: A0002 LOGIN support@sons-of-arthrose.com ****** in /usr/local/apache/htdocs/roundcube/program/include/rcube_imap.php on line 191 (POST /roundcube/?_task=login&_action=login)