我已经尝试了2个多小时，试图找出这个数据库的问题所在。我已经尝试了所有方法。从重新安装服务器，重新启动进程，重新启动等等。在尝试连接时，它总是给我这个错误：

const serverSelectionError = new ServerSelectionError();
                               ^
MongooseServerSelectionError: connect ECONNREFUSED ::1:27017
    at NativeConnection.Connection.openUri (D:\TheShed\MX_\node_modules\mongoose\lib\connection.js:797:32)
    at D:\TheShed\MX_\node_modules\mongoose\lib\index.js:330:10
    at D:\TheShed\MX_\node_modules\mongoose\lib\helpers\promiseOrCallback.js:32:5
    at new Promise (<anonymous>)
    at promiseOrCallback (D:\TheShed\MX_\node_modules\mongoose\lib\helpers\promiseOrCallback.js:31:10)
    at Mongoose._promiseOrCallback (D:\TheShed\MX_\node_modules\mongoose\lib\index.js:1151:10)
    at Mongoose.connect (D:\TheShed\MX_\node_modules\mongoose\lib\index.js:329:20)
    at module.exports (D:\TheShed\MX_\other\DB\mong.js:4:20)
    at D:\TheShed\MX_\app.js:195:37
    at Object.<anonymous> (D:\TheShed\MX_\app.js:197:3) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) {
      'localhost:27017' => ServerDescription {
        _hostAddress: HostAddress { isIPv6: false, host: 'localhost', port: 27017 },
        address: 'localhost:27017',
        type: 'Unknown',
        hosts: [],
        passives: [],
        arbiters: [],
        tags: {},
        minWireVersion: 0,
        maxWireVersion: 0,
        roundTripTime: -1,
        lastUpdateTime: 1421094,
        lastWriteDate: 0,
        error: MongoNetworkError: connect ECONNREFUSED ::1:27017
            at connectionFailureError (D:\TheShed\MX_\node_modules\mongodb\lib\cmap\connect.js:293:20)
            at Socket.<anonymous> (D:\TheShed\MX_\node_modules\mongodb\lib\cmap\connect.js:267:22)
            at Object.onceWrapper (node:events:510:26)
            at Socket.emit (node:events:390:28)
            at emitErrorNT (node:internal/streams/destroy:164:8)
            at emitErrorCloseNT (node:internal/streams/destroy:129:3)
            at processTicksAndRejections (node:internal/process/task_queues:83:21)
      }
    },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  }
}

这个错误无论我怎么做都无法解决。MongoDB服务器正在运行，我已经通过〉show dbs检查过了，它列出了它们，而且很好。另外，C：/data/db也存在，也很好。我该怎么做？下面是我的连接代码：

(async () => {
    await require('./other/DB/mong')();
    console.log("Connected to Database.");
})();

这里是./other/DB/mong：

var mongoose = require("mongoose");
module.exports = async () => {
    await mongoose.connect('mongodb://localhost:27017/MX', {
        keepAlive: true,
        useNewUrlParser: true,
        useUnifiedTopology: true
    });
    return mongoose;
}