Roundcube - Database error connection failed

Hello,

This morning, I tried to log in to my webmail and this message appeared on roundcube - database error connection failed. Since I'm using unmanaged hosting I can't get my hosting provider to help me out. Can you guys give me some suggestions to troubleshoot this? Thanks in advance.

First have a look if your mysql database server is running , then check that the round cube database exists and has tables in it , then check the username and password in /usr/local/apache/htdocs/roundcube/config.inc.php