"unknown password verifier"

[Adam Tauno Williams]

> I've restored a mail store to a box and installed the Cyrus packages,
> and copied the configuration files from a *WORKING* Cyrus server.  But
> whenever I try to authenticate I get a "unknown password verifier"
> message in the logs:
> Oct 30 09:51:37 aleph imap[12614]: accepted connection
> Oct 30 09:51:40 aleph imap[12614]: unknown password verifier
> Oct 30 09:51:40 aleph imap[12614]: badlogin: [192.168.1.81] plaintext
> adam SASL(-4): no mechanism available: checkpass failed
> This is on OpenSuSE 10.1 using the provided packages, same as the working server.
> Packages installed:
> cyrus-sasl-2.1.21-18
> cyrus-sasl-saslauthd-2.1.21-18.3
> cyrus-imapd-2.2.12-27
> Test saslauthd wors:
> aleph:/home/awilliam/tmp # testsaslauthd -u adam -p *******
> 0: OK "Success."
> aleph:/home/awilliam/tmp # grep sasl /etc/imapd.conf
> sasl_pwcheck_method: saslauthd
> sasl_mech_list: PLAIN
> allowplaintext: 1
> Any clues?  As far as I can tell configuration is identical to working
> server.

Unable to authenticate to IMAP server.
IMAP command failed: Login failed: no mechanism available