I have a problem after following the "The Perfect Server – Debian Squeeze (Debian 6.0) With BIND & Dovecot [ISPConfig 3]" documentation But Dovecot doesn't want to start : Code: # /etc/init.d/dovecot restart Restarting IMAP/POP3 mail server: dovecotIf you have trouble with authentication failures, enable auth_debug setting. See http://wiki.dovecot.org/WhyDoesItNotWork This message goes away after the first successful login. . I read the indicated page, but can't solve the problem. When I try to send a mail from command line, I have this on the mail.err log : Code: Dec 7 07:37:51 osireion dovecot: auth-worker(default): mysql: Connect failed to localhost (dbispconfig): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) - waiting for 1 seconds before retry Dec 7 07:37:51 osireion dovecot: auth-worker(default): sql(firstname.lastname@example.org,18.104.22.168): Password query failed: Not connected to database What's wrong ?