cyradm and allowing only encrypted passwords with 2.3.16?

[Patrick Goetz]

I was having problems making Cyrus 2.2.x work with only encrypted
passwords.  Setting

    allowplaintext: no

in imapd.conf prevents plain text logins, but then cyradm stops working:

    ibis:~etc$ cyradm localhost
    Login disabled.
    cyradm: cannot authenticate to server as pgoetz


I thought this was fixed in 2.3.x, but apparently not.  I'm having
exactly the same problem.  If I set allowplaintext: no, then cyradm
stops working as described above.

Any thoughts on this?