Hello,

i´ve got a problem with the dovecot authentication against active directory. I´m using dovecot 2.0.19 and windows server 2008 R2.

When I try to login via telnet I get the following error message: a NO [AUTHENTICATIONFAILED] Authentication failed.

My dovecot configuration:

# 2.0.19: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-60-generic x86_64 Ubuntu 12.04.4 LTS ext4 auth_mechanisms = plain login auth_username_format = %Lu disable_plaintext_auth = no first_valid_gid = 1001 first_valid_uid = 1001 last_valid_gid = 1001 last_valid_uid = 1001 log_path = /var/log/dovecot.log mail_location = maildir:/srv/mail/%u passdb { args = /etc/dovecot/dovecot-ldap.conf driver = ldap } protocols = imap ssl = no syslog_facility = local7 userdb { args = /etc/dovecot/dovecot-ldap.conf driver = ldap } valid_chroot_dirs = /srv/mail

My dovecot-ldap.conf:

hosts = ************** dn = CN=*****,OU=*****,OU=*****,OU=*****,DC=******,DC=*****,DC=de dnpass = **************** tls = no debug_level = -1 ldap_version = 2 base = OU=*****,DC=*****,DC=*****,DC=de deref = never scope = subtree user_attrs = sAMAccountName=home user_filter = (&(ObjectClass=user)(|(mail=%u)(sAMAccountName=%u))) pass_filter = (&(ObjectClass=user)(sAMAccountName=%u)) default_pass_scheme = plain

could anybody help me with this problem? Thanks in advance!

Regards,

Tobias Dummert