client logs in but cant list mailbox

[Rupert]

Wen I conect to the cyrus murder frontend with an imap client i cant get
the inbox list,and it seems that cyrus than runs amok and gets hammerd.
When I close the mail client it still says he is logged in.

this is the maillog entry:

Jan 12 15:11:11 mail2 imap[4591]: login: localhost.localdomain
[127.0.0.1] stefan DIGEST-MD5 User logged in
Jan 12 15:11:11 mail2 master[4593]: about to exec
/usr/lib/cyrus-imapd/proxyd
Jan 12 15:11:11 mail2 imap[4592]: accepted connection
Jan 12 15:11:11 mail2 imap[4592]: login: localhost.localdomain
[127.0.0.1] stefan DIGEST-MD5 User logged in
Jan 12 15:11:11 mail2 imap[4593]: executed
Jan 12 15:11:11 mail2 master[4594]: about to exec
/usr/lib/cyrus-imapd/proxyd
Jan 12 15:11:11 mail2 imap[4593]: accepted connection
Jan 12 15:11:11 mail2 imap[4594]: executed
Jan 12 15:11:11 mail2 imap[4593]: login: localhost.localdomain
[127.0.0.1] stefan DIGEST-MD5 User logged in
Jan 12 15:11:11 mail2 master[4595]: about to exec
/usr/lib/cyrus-imapd/proxyd
Jan 12 15:11:11 mail2 imap[4594]: accepted connection
Jan 12 15:11:11 mail2 imap[4595]: executed
Jan 12 15:11:11 mail2 imap[4594]: login: localhost.localdomain
[127.0.0.1] stefan DIGEST-MD5 User logged in
Jan 12 15:11:11 mail2 master[4596]: about to exec
/usr/lib/cyrus-imapd/proxyd
Jan 12 15:11:11 mail2 imap[4595]: accepted connection
Jan 12 15:11:11 mail2 imap[4596]: executed
Jan 12 15:11:11 mail2 imap[4595]: login: localhost.localdomain
[127.0.0.1] stefan DIGEST-MD5 User logged in
Jan 12 15:11:11 mail2 master[4597]: about to exec
/usr/lib/cyrus-imapd/proxyd
Jan 12 15:11:11 mail2 imap[4596]: accepted connection
Jan 12 15:11:11 mail2 imap[4597]: executed
Jan 12 15:11:11 mail2 imap[4596]: login: localhost.localdomain
[127.0.0.1] stefan DIGEST-MD5 User logged in
Jan 12 15:11:11 mail2 master[4598]: about to exec
/usr/lib/cyrus-imapd/proxyd
Jan 12 15:11:11 mail2 imap[4597]: accepted connection
---
this is the only not looking good entry in the /var/log/messages

Jan 12 15:09:28 mail2 lmtpd: could not getenv(CYRUS_SERVICE); exiting

my other problem with lmtp is that postfix cant connect to the lmtpproxyd

---
accepted connection
Jan 13 11:19:30 mail2 lmtpunix[3681]: lmtp connection preauth'd as postman
Jan 13 11:19:30 mail2 mupdate[3653]: cmd_find(fd:17, user.stefan)
Jan 13 11:19:30 mail2 mupdate[3653]: cmd_find(fd:17, user.stefan)
Jan 13 11:19:30 mail2 lmtpunix[3681]: connect(localhost) failed: 
Connection refused
Jan 13 11:19:30 mail2 postfix/pipe[3679]: 0CF4A1210B3: 
to=<stefan at mailfarm21.local>, relay=cyrus, delay=0.33, 
delays=0.12/0.05/0/0.15, dsn=4.3.0, status=deferred (temporary failure)

---
thx for your help