今天在運行Node的項目，但是出現了錯誤，我上午百度，找到了一個解決的方法，把這個方法記錄下來，和大家一起分享。
解決方法：
a.先看服務啟動沒有，如果沒有啟動服務先啟動服務:net stat MongoDB
b.如果服務已經啟動了，那有可能是上次不正常關閉mongo,導致存放數據的文件被占用了，被鎖住了。只需將D:\MongoDB\db中的mongod.lock文件刪除掉。重新啟動服務net stat MongoDB即可。
連接MongoDB報錯：error: couldn't connect to server 127.0.0.1:27017 src/mongo/shell/mo
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ubuntu mongodb報錯：mongo - couldn't connect to server 127.0.0.1:27017
【mongodb】mongodb碰到 Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed : connect@src/mongo/shell/mongo.js:237:13
mongodb使用mongo報錯： Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by ::
《轉》couldn't connect to server 127.0.0.1:27017 at src/mongo/shell/mongo.js:145
MongoDB：Error: couldn’t connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017
mongoDB服務器連接不上Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException:
mongodb出現問題(Error: couldn't connect to server 127.0.0.1:27017)
SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused : connect@src/mongo/shell/mongo.js:341:17
關於couldn't connect to server 127.0.0.1 shell/mongo.js:84 exception: connect failed 問題
連接mongodb Unable to connect to server 127.0.0.1:27017: Invalid credential for database 'test'.