英文:
No connection could be made because the target machine actively refused it Golang
问题
我有一个服务器：
func main() {ln, err := net.Listen("tcp", "localhost:12345")if err != nil {log.Fatal(err)}for {conn, err := ln.Accept()if err != nil {fmt.Println("Error during Accept")fmt.Println(err)return}_, err = ws.Upgrade(conn)if err != nil {fmt.Println("Error during Upgrade")fmt.Println(err)return}go func() {// 一些代码}()}}
还有一个客户端，试图连接到我的计算机：
func main() {buf := new(bytes.Buffer)payload := []byte("Hello World!")err := binary.Write(buf, binary.LittleEndian, payload)if err != nil {fmt.Println("Error during writing into Binary")fmt.Println(err)return}conn, err := net.Dial("tcp", "37.57.79.119:12345")if err != nil {fmt.Println("Error during Dialing")fmt.Println(err)return}buf.WriteTo(conn)defer conn.Close()answer, _ := io.ReadAll(conn)fmt.Println(string(answer))}
我的系统是 Kubuntu 20.04，我为 Windows 编译了客户端，并将其发送给我的朋友。在朋友的机器上，他运行它，然后收到错误消息：
Error during Dialingdial tcp 37.57.79.119:12345: connectex: No connection could be made because the target machine actively refused it.
为什么？我的防火墙已关闭。
英文:
I have server:
func main() {ln, err := net.Listen("tcp", "localhost:12345")if err != nil {log.Fatal(err)}for {conn, err := ln.Accept()if err != nil {fmt.Println("Error during Accept")fmt.Println(err)return}_, err = ws.Upgrade(conn)if err != nil {fmt.Println("Error during Upgrade")fmt.Println(err)return}go func() {some code}}()}}
and client, which trying to connect to my computer:
func main() {buf := new(bytes.Buffer)payload := []byte("Hello World!")err := binary.Write(buf, binary.LittleEndian, payload)if err != nil {fmt.Println("Error during writing into Binary")fmt.Println(err)return}conn, err := net.Dial("tcp", "37.57.79.119:12345")if err != nil {fmt.Println("Error during Dialing")fmt.Println(err)return}buf.WriteTo(conn)defer conn.Close()answer, _ := io.ReadAll(conn)fmt.Println(string(answer))}
My system is Kubuntu 20.04, I compiling client for windows, and send it to my friend. On friend machine, he launches it, and receives error:
Error during Dialingdial tcp 37.57.79.119:12345: connectex: No connection could be made because the target machine actively refused it.
Why? My Firewall is off.
答案1
得分: 4
net.Listen("tcp", "localhost:12345")正在监听localhost，客户端正在尝试通过IP连接。
尝试在localhost上连接客户端
net.Dial("tcp", "localhost:12345")
或者在0.0.0.0上监听服务器
net.Listen("tcp", "0.0.0.0:12345")
英文:
net.Listen("tcp", "localhost:12345") is listening on localhost and client is trying to connect by IP.
Try connecting client on localhost
net.Dial("tcp", "localhost:12345")
Or listen the server on 0.0.0.0
net.Listen("tcp", "0.0.0.0:12345")
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