CYRUSError: (15, 'LOGINPLAIN', 'Encryption needed to use mechanism')

[Henning]

Adding a new user in kolab-webadmin results in a cyrus-connection error,
claiming that encryption is needed. In fact, it isn't, I checked via
telnet on port 143. Here is the python exception trace:

  File "/usr/local/lib/python2.7/dist-packages/kolabd/process.py", line
45, in synchronize
    auth.synchronize()
  File
"/usr/local/lib/python2.7/dist-packages/pykolab/auth/__init__.py", line
243, in synchronize
    self._auth.synchronize(mode=mode)
  File
"/usr/local/lib/python2.7/dist-packages/pykolab/auth/ldap/__init__.py",
line 876, in synchronize
    callback=self._synchronize_callback,
  File
"/usr/local/lib/python2.7/dist-packages/pykolab/auth/ldap/__init__.py",
line 2416, in _search
    secondary_domains
  File "<string>", line 10, in <module>
  File
"/usr/local/lib/python2.7/dist-packages/pykolab/auth/ldap/__init__.py",
line 2160, in _persistent_search
    secondary_domains=secondary_domains
  File
"/usr/local/lib/python2.7/dist-packages/pykolab/auth/ldap/__init__.py",
line 2010, in _synchronize_callback
    entry['type']
  File "<string>", line 1, in <module>
  File
"/usr/local/lib/python2.7/dist-packages/pykolab/auth/ldap/__init__.py",
line 1190, in _change_add_user
    entry[mailserver_attribute]
  File
"/usr/local/lib/python2.7/dist-packages/pykolab/imap/__init__.py", line
423, in user_mailbox_create
    additional_folders
  File
"/usr/local/lib/python2.7/dist-packages/pykolab/imap/__init__.py", line
450, in user_mailbox_create_additional_folders
    self.login_plain(admin_login, admin_password, folder)
  File "/usr/local/lib/python2.7/dist-packages/cyruslib.py", line 429,
in login_plain
    self.__doexception("LOGINPLAIN", self.ERROR.get("LOGINPLAIN")[1])
  File "/usr/local/lib/python2.7/dist-packages/cyruslib.py", line 359,
in __doexception
    self.__doraise( function.upper(), msg )
  File "/usr/local/lib/python2.7/dist-packages/cyruslib.py", line 368,
in __doraise
    raise CYRUSError( idError[0], mode, msg )
CYRUSError: (15, 'LOGINPLAIN', 'Encryption needed to use mechanism')

Henning