Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/tryton/gui/window/dblogin.py", line 299, in refresh_databases_end
    if self.test_server_version(host, port) is False:
  File "/usr/lib64/python2.7/site-packages/tryton/gui/window/dblogin.py", line 269, in test_server_version
    version = rpc.server_version(host, port)
  File "/usr/lib64/python2.7/site-packages/tryton/rpc.py", line 57, in server_version
    result = connection.common.server.version()
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1243, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib64/python2.7/site-packages/tryton/jsonrpc.py", line 287, in __request
    verbose=self.__verbose
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1283, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1313, in single_request
    response = h.getresponse(buffering=True)
  File "/usr/lib64/python2.7/httplib.py", line 1136, in getresponse
    response.begin()
  File "/usr/lib64/python2.7/httplib.py", line 453, in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python2.7/httplib.py", line 417, in _read_status
    raise BadStatusLine(line)
BadStatusLine: ''