[Dovecot] auth(default): vmysql: sql error[3]: MySQL server has gone away

Hi all, I'm facing this error:

dovecot: auth(default): vmysql: sql error[3]: MySQL server has gone away

I've been reading this list archives and seems to be a resolved issue (back to 2005), so dovecot should just reconnect but it does not so. I'm using dovecot 1.1.3 with vpopmail 5.4.25 with this configuration:

# 1.1.3: /usr/local/etc/dovecot.conf listen: *:143 ssl_disable: yes disable_plaintext_auth: no login_dir: /usr/local/var/run/dovecot/login login_executable: /usr/local/libexec/dovecot/imap-login verbose_proctitle: yes first_valid_uid: 89 last_valid_uid: 89 mail_location: maildir:/home/vpopmail/domains/%d/%n/Maildir auth default: passdb: driver: vpopmail userdb: driver: vpopmail

Any ideas?

Thanks you!

-- Jordi