robomongo連接報錯Cannot connect to the MongoDB at localhost:27017

用robo連接mongo時，出現下面這種錯誤，一般是因爲Mongodb的服務沒有打開，自己在服務中打開或者重啓mongoDB服務即可正常連接 Cannot connect to the MongoDB at localhost:27017. Error: Network is unreachable. Reason: couldn't connect to server localhost:270

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