```shell $ mongo MongoDB shell version: 3.0.7 connecting to: test 2015-10-25T14:32:57.535+0800 W NETWORK Failed to connect to 127.0.0.1:27017, reason: errno:61 Connection refused 2015-10-25T14:32:57.537+0800 E QUERY Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed at connect (src/mongo/shell/mongo.js:179:14) at (connect):1:6 at src/mongo/shell/mongo.js:179 exception: connect failed ``` 之前一直都可以，自从升级了 captain 后... 搜索一圈后无果，不知道是什么原因，特来求助。