Hi,Thanks for your reply :)Yes, I'm susing both Debian and dovecot 0.99.14I tried to connect using tcp and the authentication stills fails.With the db_unix_socket line comented I still get this error on my mail logfiledovecot-auth: MySQL: Can't connect to database dovecot: Can't connect to local MySQL server through socket '/var/tmp/mysql.sock'I checked /etc/mysql/my.cnf and the path is correct: /var/run/mysqld/mysqld.sock.Any ideias? :(Thanks,Pedro