[Dovecot] Authenticate login failed: Unsupported authentication mechanism

[Chris Wakelin]

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!


-- 
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Christopher Wakelin,                           c.d.wakelin at 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