the problem seams to be related to the plain authentication disabled without the TLS as reported in http://www.irbs.net/internet/info-cyrus/0401/0578.html activating the tls paramenters in imapd.conf on frontend and backend everything works fine. Kind regards Maurizio > I'm going crazy configuring a standard murder architecture with 3 different > servers > 1 frontend (mx1) > 1 mupdate master (mupdate) > 1 backend (ariel) > the OS is debian etch. > the imap/pop3 and lmtp connections are not working from the frontend to the > backend ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html