/var/www/roundcubemail-0.2.1/config/db.inc.php

is there any other files?

mysql> SHOW GRANTS FOR roundcube@localhost;
+-----------------------------------------------------------------------------------------+
| Grants for roundcube@localhost                                                          |
+-----------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'roundcube'@'localhost' IDENTIFIED BY PASSWORD 'MYPASSWORD' |
| GRANT ALL PRIVILEGES ON `roundcubemail`.* TO 'roundcube'@'localhost'                    |
| GRANT ALL PRIVILEGES ON `vmail`.* TO 'roundcube'@'localhost' WITH GRANT OPTION          |
| GRANT SELECT, UPDATE ON `vmail`.`mailbox` TO 'roundcube'@'localhost'                    |
+-----------------------------------------------------------------------------------------+

DB Error: _doConnect: [Error message: Access denied for user 'roundcube'@'localhost' (using password: YES)] [Native code: 1045] [Native message: Access denied for user 'roundcube'@'localhost' (using password: YES)]  ** mysqli(mysqli)://roundcube:xxx@@localhost/vmail in /var/www/roundcubemail-0.2.1/program/include/rcube_mdb2.php on line 100 (POST /webmail/?_task=settings&_action=save-changepasswd)

Execute mysql command to fix this permission issue:

$ mysql -uroot -p
mysql> GRANT UPDATE,SELECT ON vmail.mailbox TO roundcube@localhost;

the new issue now is I "email user" can't change my password from roundecube webmail, It gives me the following error

DATABASE ERROR: CONNECTION FAILED!

and  the maillog

DB Error: _doConnect: [Error message: Access denied for user 'roundcube'@'localhost' (using password: YES)] [Native code: 1045] [Native message: Access denied for user 'roundcube'@'localhost' (using password: YES)]  ** mysqli(mysqli)://roundcube:xxx@@localhost/vmail in /var/www/roundcubemail-0.2.1/program/include/rcube_mdb2.php on line 100 (POST /webmail/?_task=settings&_action=save-changepasswd)

Thanks shake and ZhangHuangbin   for your help

MySQL is working fine now. I can start and stop the service without any problem, and without password.
I 've installed it in another server and the same problem happend.
I'm wondring if I installed mysql on the server before installing iRed Mail again?

because if you install mysql and set the mysql password.

read the wiki, hope can help you.
http://code.google.com/p/iredmail/wiki/ … ation_Tips

< INFO > ==================== MySQL ====================
< INFO > Starting MySQL.
< INFO > Sleep 5 seconds for MySQL daemon initialize: 5s 4s 3s 2s 1s.
< INFO > Setting MySQL admin's password: root.
mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/var/lib/mysql/mysql.sock' exists!
< INFO > Initialize MySQL database.
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
< INFO > Generating SQL template for postfix virtual hosts: /root/iRedMail-0.5.0-rc1/conf/mysql_vmail.sql.
< INFO > Import postfix virtual hosts/users: /root/iRedMail-0.5.0-rc1/conf/mysql_vmail.sql.ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)                [ FAILED ]

because of this erro no databases have been created and also the permissions.

although I give the installer password for MySQL administrator but  I can login  without password
mysql -p

please help.......