无法在Java中从localhost连接到localhost

Question

我编写了简单的服务器 - 客户端程序，用于将信息从客户端发送到服务器，但它不能解决以下错误：

FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
ERROR: transport error 202: connect failed: Permission denied
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [debugInit.c:750]

也有以下例外：

java.net.SocketException: Permission denied: connect
        at java.net.DualStackPlainSocketImpl.connect0(Native Method)
        at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
        at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
        at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at net.inthemoon.localhostconnectattempt.LocalhostConnectAttempt$2.run(LocalhostConnectAttempt.java:56)
        at java.lang.Thread.run(Unknown Source)

代码如下：

package net.inthemoon.localhostconnectattempt;

    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.ServerSocket;
    import java.net.Socket;
    import java.net.UnknownHostException;

    public class LocalhostConnectAttempt {

        private static String hostName = "localhost";
        private static int portNumber = 444;

        public static void main(String[] args) throws InterruptedException {


            Thread server = new Thread(new Runnable() {

                @Override
                public void run() {
                    try ( 
                        ServerSocket serverSocket = new ServerSocket(portNumber);
                        Socket clientSocket = serverSocket.accept();
                        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
                        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
                    ) {
                        String inputLine;

                        while ((inputLine = in.readLine()) != null) {
                            System.out.println("Server: " + inputLine);
                            out.println("heard you");
                            if (inputLine.equals("bye")) {
                                System.out.println("Server: exiting");
                                break;
                            }

                        }

                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });

            server.setDaemon(true);
            server.start();

            Thread client = new Thread( new Runnable() {

                @Override
                public void run() {

                    try (
                        Socket kkSocket = new Socket(hostName, portNumber);
                        PrintWriter out = new PrintWriter(kkSocket.getOutputStream(), true);
                        BufferedReader in = new BufferedReader(
                            new InputStreamReader(kkSocket.getInputStream()));
                    ) {

                        out.println("Hello world!");


                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }


                }
            });

            Thread.sleep(5000);
            client.start();




        }



    }

更新

在localhost 127.0.0.1文件中披露hosts没有帮助。

更新2

我找到了问题的根源：这是由[代理自动配置] [1]引起的。由于某种原因，127.0.0.1的地址是由代理处理并且通向代理服务器的网页。

的加入

function FindProxyForURL(url,host)
{
   if( host == '127.0.0.1' ) {
      return "DIRECT";
   }

到wpad.dat有帮助，但我仍然不明白整个效果。我有很长一段时间的代理，以前没有造成这样的影响。

所以我认为这也与IPv6或某事有关。