[Dovecot] Connection closed by foreign host.

i tried the latest dev version 2.2.2-0~auto54 for ubuntu and when i do some testing i got a connection closed.

the commands are issued through telnet:

root@i920:~# telnet localhost imap Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. the command with number 3 results everytime in a connection closed. i

• OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE
  IDLE STARTTLS AUTH=PLAIN AUTH=LOGIN] Dovecot ready. 1 LOGIN test@lokal.de 123456 1 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE
  IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS
  THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT
  CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC
  ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE
  BINARY MOVE NOTIFY COMPRESS=DEFLATE QUOTA ACL RIGHTS=texk] Logged in 2 LIST () "" (virtual/*)
• LIST () "/" virtual/All
• LIST () "/" virtual/Flagged
• LIST (\UnMarked) "/" virtual/Flagged
• LIST (\Marked) "/" virtual/All 2 OK List completed. 3 LIST () "" (*) Connection closed by foreign host.

turned on debug_log but nothing is shown there.