login in sieveshell and cyradmin not possible fter setting sa servername in imapd.conf

[Dr. Harry Knitter]

Hello list,

I have a Cyrus 2.2 running on a Debian Squeeeze box.
After setting an explicit servername in imapd.conf which is _not_ the same as 
that returned by gethostname(2).
e.g. 
servername: imap.local.domain
gethostname(2) returns machine1.local.domain

Mail-clients like KMail still can access the mailboxes.
However, cyradmin and sieveshell give me an authentication error.

Authentication runs with sasl and DIGEST-MD5

Thanks in advance


Harry