我目前正在尝试将一个用Python Flask框架构建的网站部署到Webfaction。我已经部署了一个MongoDB，我可以从MongoDB交互式解释器成功连接到它：
[celli@web498 ~]$ mongo localhost:18209/admin
MongoDB shell version: 3.0.2
connecting to: localhost:18209/admin
> db.auth("awesomeusername", "anawesomepassword")
1
启动网站时，它可以在我的烧瓶 config.py 文件中使用这些凭据成功连接：
MONGODB_SETTINGS = { "db"： "tc"， "端口"：18209，
"用户名"： "真棒用户名"， "密码"： "真棒密码"，}
但是当我访问执行查询的页面时，我收到以下错误。这段代码在另一台服务器上运行良好，因此错误在于我的MongoDB实例的设置或与它的连接。我也觉得设置连接工作正常很奇怪，但查询它会产生这个Authentication failed错误。
知道我该如何解决这个问题吗？欢迎所有提示！
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/flask_login.py", line 758, in decorated_view
return func(*args, **kwargs)
File "/home/celli/webapps/tc/tc/app/views/webviews.py", line 220, in myTickets
userDocs = UserDocument.objects(id__in=[ticket.doc_id for ticket in userTickets])
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/mongoengine/queryset/manager.py", line 37, in __get__
queryset = queryset_class(owner, owner._get_collection())
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/mongoengine/document.py", line 168, in _get_collection
db = cls._get_db()
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/mongoengine/document.py", line 162, in _get_db
return get_db(cls._meta.get("db_alias", DEFAULT_CONNECTION_NAME))
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/mongoengine/connection.py", line 143, in get_db
source=conn_settings['authentication_source'])
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/pymongo/database.py", line 978, in authenticate
self.connection._cache_credentials(self.name, credentials)
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/pymongo/mongo_client.py", line 467, in _cache_credentials
auth.authenticate(credentials, sock_info, self.__simple_command)
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/pymongo/auth.py", line 475, in authenticate
auth_func(credentials[1:], sock_info, cmd_func)
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/pymongo/auth.py", line 450, in _authenticate_default
return _authenticate_scram_sha1(credentials, sock_info, cmd_func)
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/pymongo/auth.py", line 238, in _authenticate_scram_sha1
sasl_start, sasl_continue)
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/pymongo/auth.py", line 185, in _scram_sha1_conversation
res, _ = cmd_func(sock_info, source, sasl_start)
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/pymongo/mongo_client.py", line 703, in __simple_command
helpers._check_command_response(response, None, msg)
File "/home/celli/webapps/tc/venv/lib/python2.7/site-packages/pymongo/helpers.py", line 182, in _check_command_response
raise OperationFailure(msg % errmsg, code, response)
OperationFailure: command SON([('saslStart', 1), ('mechanism', 'SCRAM-SHA-1'), ('autoAuthorize', 1), ('payload', Binary('n,,n=awesomeusername,r=NjAxNTEwMjc5MzAy', 0))]) on namespace tc.$cmd failed: Authentication failed.
MongoDB的用户是每个数据库的。在您的示例中，您显示您连接到admin数据库，但错误消息只是告诉您用户正在尝试使用tc数据库进行身份验证。可能您的用户在tc上没有角色。
（另一种可能性是tc不是要连接到的数据库;您需要在连接参数/字符串中指定正确的数据库名称）。