When qpidd is started with auth=yes and ANONYMOUS mechanism disabled, an attempt to connect to it without credentials provides confusing error:
$ qpid-stat -q
Failed: AuthenticationFailure - Error in sasl_client_start (-4) SASL(-4): no mechanism available: No worthy mechs found
While e.g. PLAIN mechanism is available.
The error should be rather "Anonymous connections disabled, missing credentials" or so.