[Dovecot] Managesieve: Remote login fails

[Brainkiller]

Hello,

I've been trying to get managesieve to work for our LAN, but when I try 
to login from a remote host i always get the following line in the log file:
dovecot: child 26014 (login) killed with signal 11

When i enable debuging, it just gives me that line, nothing more. I can 
only login from the localhost through telnet but not from a remote host.
My conf:
# 1.1.6: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.26.5.2008.10.03 i686 Debian lenny/sid ext3
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imaps managesieve
listen(default): *
listen(imap): *
listen(managesieve): *:12000
ssl_listen(default): *
ssl_listen(imap): *
ssl_listen(managesieve):
ssl_cert_file: /etc/dovecot/mail.lan-cert.pem
ssl_key_file: /etc/dovecot/mail.lan-key.pem
ssl_cipher_list: ALL:!LOW:!SSLv2
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(managesieve): /usr/lib/dovecot/managesieve-login
login_process_size: 80
login_processes_count: 6
login_max_processes_count: 256
login_max_connections: 1024
mail_access_groups: mail
mail_location: maildir:/home/mail/%u
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(managesieve): /usr/lib/dovecot/managesieve
mail_plugins(default): quota trash imap_quota fts fts_squat
mail_plugins(imap): quota trash imap_quota fts fts_squat
mail_plugins(managesieve):
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(managesieve): /usr/lib/dovecot/modules/managesieve
imap_client_workarounds(default): tb-extra-mailbox-sep
imap_client_workarounds(imap): tb-extra-mailbox-sep
imap_client_workarounds(managesieve):
dict_db_config: /etc/dovecot/dovecot-db.conf
managesieve_implementation_string(default): dovecot
managesieve_implementation_string(imap): dovecot
managesieve_implementation_string(managesieve): Cyrus timsieved v2.2.13
sieve_storage(default):
sieve_storage(imap):
sieve_storage(managesieve): /home/mail/sieve/%u/scripts
sieve(default):
sieve(imap):
sieve(managesieve): /home/mail/sieve/%u/dovecot.sieve
namespace:
  type: private
  separator: /
  inbox: yes
  list: yes
  subscriptions: yes
auth default:
  mechanisms: plain login
  cache_negative_ttl: 60
  passdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  socket:
    type: listen
    client:
      path: /var/run/dovecot/auth-client
      mode: 432
    master:
      path: /var/run/dovecot/auth-master
      mode: 438
      user: dovecot
      group: mail
plugin:
  fts: squat
  sieve: ~/.dovecot.sieve
  quota: maildir
  quota_rule: *:storage=190M
  quota_rule2: Trash:storage=50M
  acl: vfile:/etc/dovecot/dovecot-acls
  trash: /etc/dovecot/dovecot-trash.conf