发送UDP数据包时收到错误

问题描述

我在局域网中尝试通过UDP连接将数据包发送到专用IP时收到以下错误。我试图使用其他端口，并在客户端上禁用防火墙无济于事。

SocketException: An existing connection was forcibly closed by the remote host.

System.Net.sockets.socket.ReceiveFrom (System.Byte[] buffer,system.int32 offset,system.int32 size,System.Net.sockets.socketFlags socketFlags,System.Net.EndPoint& remoteEP) (at <14e3453b740b4bd690e8d4e5a013a715>:0)
System.Net.sockets.socket.ReceiveFrom (System.Byte[] buffer,System.Net.EndPoint& remoteEP) (at <14e3453b740b4bd690e8d4e5a013a715>:0)
System.Net.sockets.UdpClient.Receive (System.Net.IPEndPoint& remoteEP) (at <14e3453b740b4bd690e8d4e5a013a715>:0)

将UDP服务器与UDP客户端托管在同一台计算机上时，我没有问题。

下面是客户端。

using System.Net.sockets;
using System.Net;

private void Start()
{
    var client = new UdpClient();
    IPEndPoint ep = new IPEndPoint(IPAddress.Parse("192.168.1.20"),20003); // endpoint where server is listening
    client.Connect(ep);

    // send data
    client.Send(new byte[] { 1,2,3,4,5 },5);

    // then receive data
    var receivedData = client.Receive(ref ep);

    Debug.Log("receive data from " + ep.ToString());
}

下面是服务器端。

import socket

localIP = "127.0.0.1"
localPort = 20003
bufferSize = 1024

msgFromServer = "Hello UDP Client"

bytesToSend = str.encode(msgFromServer)

# Create a datagram socket
UDPServerSocket = socket.socket(family=socket.AF_INET,type=socket.soCK_DGRAM)

# Bind to address and ip
UDPServerSocket.bind((localIP,localPort))

print("UDP server up and listening")

# Listen for incoming datagrams
while True:
    bytesAddresspair = UDPServerSocket.recvfrom(bufferSize)
    message = bytesAddresspair[0]
    address = bytesAddresspair[1]
    clientMsg = "Message from Client:{}".format(message)
    clientIP  = "Client IP Address:{}".format(address)
    print(clientMsg)
    print(clientIP)

    # Sending a reply to client
    UDPServerSocket.sendto(bytesToSend,address)

解决方法

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c#c#python-3.x udpclient