Which version of Dovecot? Do you have "disable_plaintext_auth" set to "yes" but not using SSL/TLS?

Best Wishes, Chris

Orchun Kolcu wrote:

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!

-- --+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+- Christopher Wakelin, c.d.wakelin@reading.ac.uk IT Services Centre, The University of Reading, Tel: +44 (0)118 378 8439 Whiteknights, Reading, RG6 2AF, UK Fax: +44 (0)118 975 3094

On 1.7.2005, at 02:24, Orchun Kolcu wrote:

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

This error happens if you haven't set "mechanisms = plain" in auth block in config file.

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

But this shows that you have set it, so it's a bit strange.. Do you have multiple auth blocks defined maybe?