问mongoengine.connection.ConnectionError:无法连接到数据库默认值：[Errno 111]连接被拒绝

EN

Traceback (most recent call last):
  File "/home/dk2459/.local/lib/python3.4/site-packages/pymongo/mongo_client.py", line 374, in __init__
    self._ensure_connected(True)
  File "/home/dk2459/.local/lib/python3.4/site-packages/pymongo/mongo_client.py", line 939, in _ensure_connected
    self.__ensure_member()
  File "/home/dk2459/.local/lib/python3.4/site-packages/pymongo/mongo_client.py", line 813, in __ensure_member
    member, nodes = self.__find_node()
  File "/home/dk2459/.local/lib/python3.4/site-packages/pymongo/mongo_client.py", line 904, in __find_node
    raise AutoReconnect(', '.join(errors))
pymongo.errors.AutoReconnect: [Errno 111] Connection refused
During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/dk2459/.local/lib/python3.4/site-packages/mongoengine/connection.py", line 133, in get_connection
    _connections[alias] = connection if connection else connection_class(**conn_settings)
  File "/home/dk2459/.local/lib/python3.4/site-packages/pymongo/mongo_client.py", line 377, in __init__
    raise ConnectionFailure(str(e))
pymongo.errors.ConnectionFailure: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "create_admin.py", line 7, in <module>
    connect('happy_lens')
  File "/home/dk2459/.local/lib/python3.4/site-packages/mongoengine/connection.py", line 173, in connect
    return get_connection(alias)
  File "/home/dk2459/.local/lib/python3.4/site-packages/mongoengine/connection.py", line 135, in get_connection
    raise ConnectionError("Cannot connect to database %s :\n%s" % (alias, e))
mongoengine.connection.ConnectionError: Cannot connect to database default :
[Errno 111] Connection refused

import getpass

from mongoengine import connect

from models import User

connect('happy_lens')

admin = User(username='dk', email='someemail@gmail.com')
admin.password='pwd'
admin.save()

DATABASES = {
    'default' : {
        'ENGINE': 'django_mongodb_engine',
        'NAME': 'happy_lens',
        'HOST': '192.168.1.35',
        'POST': 12345

   }
}

SESSION_ENGINE = 'mongoengine.django.sessions'