SASL LOGIN authentication failed: Invalid authentication mechanism

[l***@airstreamcomm.net]

I am trying to get SASL (with dovecot) setup on postfix 2.6.6 and
receiving this warning:

warning: domain.tld[ip.add.re.ss]: SASL LOGIN authentication failed:
Invalid authentication mechanism

There are a number of successful SASL attempts, but a large number of
these warnings are occurring as well.

Postconf -n:

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
default_destination_recipient_limit = 1000
default_process_limit = 1000
html_directory = no
inet_interfaces = all
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
message_size_limit = 52224000
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
myhostname = osmtp-3.airstreamcomm.net
mynetworks = $config_directory/mynetworks
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES
recipient_bcc_maps = hash:/etc/postfix/recipient_bcc
relayhost = omrcd1.parcel-airstreamcomm.net
sample_directory = /usr/share/doc/postfix-2.6.6/samples
sender_bcc_maps = hash:/etc/postfix/sender_bcc
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_data_done_timeout = 900s
smtp_data_init_timeout = 900s
smtp_data_xfer_timeout = 900s
smtp_helo_timeout = 900s
smtp_mail_timeout = 900s
smtp_tls_note_starttls_offer = yes
smtpd_client_event_limit_exceptions = static:all
smtpd_helo_required = yes
smtpd_recipient_restrictions = permit_mynetworks,
permit_sasl_authenticated, check_client_access
mysql:/etc/postfix/authb4smtp.cf, reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = reject_unknown_sender_domain,
reject_non_fqdn_sender, permit
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/pki/tls/certs/postfix.crt
smtpd_tls_key_file = /etc/pki/tls/private/postfix.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:/var/lib/postfix/smtpd_tls_cache
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550

[Patrick Ben Koetter]

Post by l***@airstreamcomm.net
I am trying to get SASL (with dovecot) setup on postfix 2.6.6 and
Invalid authentication mechanism

The client attempts to use a mechanism Postfix does not offer. Actually it is
dovecot - acting as SASL service - who offers a list of mechanisms to Postfix
and Postfix just passes it on.

Take a list at $auth_mechanisms in /etc/dovecot/conf.d/10-auth.conf and see
if you can match what your clients ask for.

***@rick

[Wietse Venema]

Post by l***@airstreamcomm.net
I am trying to get SASL (with dovecot) setup on postfix 2.6.6 and

This means that the client sent an "AUTH LOGIN" command, i.e.
a request to use the LOGIN authentication method.

Post by l***@airstreamcomm.net
Invalid authentication mechanism

This means that Postfix SMTP daemon rejects the LOGIN authentication
method, because it's not on the list of methods that the Dovecot
server is configured to support.

Wietse

[l***@airstreamcomm.net]

Post by Patrick Ben Koetter

Post by l***@airstreamcomm.net
I am trying to get SASL (with dovecot) setup on postfix 2.6.6 and
Invalid authentication mechanism

The client attempts to use a mechanism Postfix does not offer. Actually it is
dovecot - acting as SASL service - who offers a list of mechanisms to Postfix
and Postfix just passes it on.
Take a list at $auth_mechanisms in /etc/dovecot/conf.d/10-auth.conf and see
if you can match what your clients ask for.

Thanks that did the trick.

[/dev/rob0]

Post by Wietse Venema

Post by l***@airstreamcomm.net
I am trying to get SASL (with dovecot) setup on postfix 2.6.6
?warning: domain.tld[ip.add.re.ss]: SASL LOGIN authentication

This means that the client sent an "AUTH LOGIN" command, i.e.
a request to use the LOGIN authentication method.

It's perhaps also worthy of note to mention that the client is
broken. It should not attempt to use an unlisted AUTH mechanism.

Post by Wietse Venema

Post by l***@airstreamcomm.net
Invalid authentication mechanism

This means that Postfix SMTP daemon rejects the LOGIN
authentication method, because it's not on the list of methods
that the Dovecot server is configured to support.