MongoDB Atlas에 대한 Golang mgo 연결이 \'접근 가능한 서버 없음\' 오류로 인해 계속 실패하는 이유는 무엇입니까?

import (
    "gopkg.in/mgo.v2"
    "crypto/tls"
    "net"
)

// Configure TLS settings
tlsConfig := &tls.Config{}

// Initialize the DialInfo object
dialInfo := &mgo.DialInfo{
    Addrs: []string{"prefix1.mongodb.net:27017", 
                    "prefix2.mongodb.net:27017",
                    "prefix3.mongodb.net:27017"},
    Database: "authDatabaseName",
    Username: "user",
    Password: "pass",
}

// Override the default DialServer method
dialInfo.DialServer = func(addr *mgo.ServerAddr) (net.Conn, error) {
    conn, err := tls.Dial("tcp", addr.String(), tlsConfig)
    return conn, err
}

// Establish the connection using DialWithInfo
session, err := mgo.DialWithInfo(dialInfo)

Addrs: []string{"prefix2.mongodb.net:27017"}

// URI without ssl=true
var mongoURI = "mongodb://username:[email protected],prefix2.mongodb.net,prefix3.mongodb.net/dbName?replicaSet=replName&authSource=admin"

dialInfo, err := mgo.ParseURL(mongoURI)

// Subsequent code remains similar to the previous example.