MongoError：没有授权在sails上执行命令{listIndexes：“sessions”，cursor：{}}

Question

我有一台运行mongo的ec2机器。当我尝试从另一台ec2机器连接时，我遇到了以下错误

PublishSubject<Object> timeout = PublishSubject.create();

Observable.from(sources).concatMapDelayError(v -> v.onErrorResumeNext(e -> {
    if (e instanceof TimeoutException) {
        timeout.onError(e);
        return Observable.empty();
    }
    return Observable.error(e);
}))
.takeUntil(timeout)
.subscribe(...);

我的sails db有以下用户：

MongoError: not authorized on sails to execute command { listIndexes: "sessions", cursor: {} }
  at Function.MongoError.create (/home/ec2-user/backstage/node_modules/connect-mongo/node_modules/mongodb-core/lib/error.js:31:11)
  at queryCallback (/home/ec2-user/backstage/node_modules/connect-mongo/node_modules/mongodb-core/lib/cursor.js:281:36)
  at Callbacks.emit (/home/ec2-user/backstage/node_modules/connect-mongo/node_modules/mongodb-core/lib/topologies/server.js:95:3)
  at Connection.messageHandler (/home/ec2-user/backstage/node_modules/connect-mongo/node_modules/mongodb-core/lib/topologies/server.js:249:23)
  at Socket.<anonymous> (/home/ec2-user/backstage/node_modules/connect-mongo/node_modules/mongodb-core/lib/connection/connection.js:265:22)
  at emitOne (events.js:96:13)
  at Socket.emit (events.js:188:7)
  at readableAddChunk (_stream_readable.js:176:18)
  at Socket.Readable.push (_stream_readable.js:134:10)
  at TCP.onread (net.js:547:20)