Hi, Thanks for pointing out the typo. > Your log indicates its a TLS negotioation failure. This may be missleading as I use SSL, not TLS. > Does it work if you don't use TLS? If I configure without SSL: ldap_servers: ldap://ldap.cs.ait.ac.th/ If I configure with SSL: ldap_servers: ldaps://ldap.cs.ait.ac.th/ > At a guess, one of the problems you may be having on the saslauthd side is > that it can't find the CA cert to validate the connection. In saslauthd I haveL ldap_tls_cacert_file: /usr/local/ssl/ca/ait-itserv.crt The file exists and is the CA used by all other services like pam_ldap: tls_cacertfile /usr/local/ssl/ca/ait-itserv.crt Thanks, Olivier