连接在远程IP上被拒绝，但在本地IP上被接受 [英] Connection refused on remote IP, but accepted on local IP

问题描述

正如标题所说，我让我的服务器在本地机器上运行，我测试并调试它并且它工作得很好（服务器也用java编写）。但当我尝试使用我的远程IP（而不是192.168.0.113，我使用146.255.xx）测试它，并且服务器没有收到任何东西，而客户端抛出了这个：

As the title says, I have my server running on a local machine, I tested and debugged it and it worked perfectly (server is written in java as well). But when I tried to test it with my remote IP (instead of 192.168.0.113 I used 146.255.x.x), and the server didn't receive anything, while the client has thrown this:

09-04 18:23:27.595: W/System.err(24241): java.net.ConnectException: failed to connect to /146.255.x.x (port 4040): connect failed: ECONNREFUSED (Connection refused)
09-04 18:23:27.595: W/System.err(24241):    at libcore.io.IoBridge.connect(IoBridge.java:114)
09-04 18:23:27.595: W/System.err(24241):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
09-04 18:23:27.595: W/System.err(24241):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
09-04 18:23:27.595: W/System.err(24241):    at java.net.Socket.startupSocket(Socket.java:566)
09-04 18:23:27.595: W/System.err(24241):    at java.net.Socket.tryAllAddresses(Socket.java:127)
09-04 18:23:27.595: W/System.err(24241):    at java.net.Socket.<init>(Socket.java:177)
09-04 18:23:27.595: W/System.err(24241):    at java.net.Socket.<init>(Socket.java:149)
09-04 18:23:27.595: W/System.err(24241):    at com.statenislandchat.Main$2$1$1.run(Main.java:146)
09-04 18:23:27.595: W/System.err(24241): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
09-04 18:23:27.595: W/System.err(24241):    at libcore.io.Posix.connect(Native Method)
09-04 18:23:27.600: W/System.err(24241):    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
09-04 18:23:27.600: W/System.err(24241):    at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
09-04 18:23:27.600: W/System.err(24241):    at libcore.io.IoBridge.connect(IoBridge.java:112)
09-04 18:23:27.600: W/System.err(24241):    ... 7 more

我很久以前在服务器PC上禁用了防火墙，我在路由器上转发了端口。我尝试了一些portscanners，他们都检测到我的端口上的服务，但我的客户端无法一次又一次地到达它。

I disabled the firewall on the server PC long ago, and I DID forward the ports on my router. I tried with some portscanners and they all detect a service on my port, but my client fails to reach it again and again.

已解决！
我对网络的关注不多，但如果服务器和客户端都在同一台路由器上，似乎无法像这样连接。我尝试从远程客户端连接并且它有效。

SOLVED! I'm not much into networking but it seems that its impossible to connect like this if both the server and client are on the same router. I tried connecting from a distant client and it worked.

推荐答案

ECONNREFUSED表示尝试连接，远程主机回答没人在监听该端口。这可能意味着几件事：

ECONNREFUSED means that the connection was attempted and the remote host answered back that nobody's listening on that port. That could mean several things:

1. 这真的是你的IP吗？ ifconfig / ipconfig说什么（提示：不一定是什么whatismyip.com会说）？


2. Java服务器是否监听所有接口？同一端口可以在localhost上打开，在其他接口上关闭。检查服务器上的绑定地址。


3. 尝试使用telnet + tcpdump，是否显示数据包到达正确的地址？

这些只是一个开始。

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