[Dovecot] Authenticate login failed: Unsupported authentication mechanism

[Orchun Kolcu]

Hi,

I just switched (or tried to) from UW-IMAP to dovecot. When I try to
login through the telnet client I get:
1 NO Authentication failed and in the log I get:
imap-login: Authenticate PLAIN failed: Unsupported authentication
mechanism

If I try to login through the IMAP client (Thunderbird), in the log I
get the slightly different:
imap-login: Authenticate login failed: Unsupported authentication
mechanism

Here's the auth setup from the conf:
auth default {
  mechanisms = plain
  passdb = pam imap
  userdb = passwd
  user = root
}

And here's /etc/pam.d/imap for good measure:
auth       required     pam_nologin.so
auth       required     pam_stack.so service=system-auth
account    required     pam_stack.so service=system-auth
session    required     pam_stack.so service=system-auth


The server is a fairly standard Redhat 8 setup. Any idea what's going
on? Thanks!
-- 
  Orchun Kolcu
  orchunk at fastem.com

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