El 06/05/15 a las 10:53, Angel L. Mateo escribió:

Hello,

 I've been using dovecot for a long time, but now I'm having

troubles with I change I need to make.

 I have a director server in front of two backend servers. All of

these servers are running dovecot 2.1.16. Redirection to backend servers are based in an attribute of a ldap server. My users are defined in this same ldap server.

 At this moment, for user authentication we use password lookups. My

current configuration at both frontend and backend servers is attached. But now I need to change it to bind authentication, so the only change I've made is changing "auth_bind=no" to "auth_bind=yes".

 After this change, backend servers are working fine. Director

servers are also working for POP and IMAP connections, but for LMTP they are returning:

May 6 10:23:35 myotis40 dovecot: lmtp(48026): Error: user myuser@um.es: Auth PASS lookup failed

 This error is returned without any ldap lookup, neither connection

to backend servers.

 Any help? thanks in advance.

I'm sorry. As soon as I ask, the sooner I find the answer :-(

I have found in a reply to a similar question in this same list 

(http://www.dovecot.org/list/dovecot/2011-November/079687.html) that a passdb database for lmtp can't use auth_bind=yes because lmtp can't make any authentication. So I left my director server with auth_bind=no and backends with auth_bind=yes and it works.

-- Angel L. Mateo Martínez Sección de Telemática Área de Tecnologías de la Información y las Comunicaciones Aplicadas (ATICA) http://www.um.es/atica Tfo: 868887590 Fax: 868888337