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Asked: 2026-05-31T05:08:49+00:00

Possible Duplicate: Java sockets – java.net.ConnectException: Connection refused: connect I’ve created a simple chat

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Possible Duplicate:
Java sockets – java.net.ConnectException: Connection refused: connect

I’ve created a simple chat program which communicates using sockets. Everything works fine when I’m running it on localhost. However, the problems occur when I try to link the client and server programs using my IP.

http://www.canyouseeme.org/ can connect to my server on port 9999 so I know that the server is fine and the port is open. However, my client can’t connect.

The error log…

java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(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 Client.connect(Client.java:129)
at Client.main(Client.java:47)

Does anybody have any idea what might be causing this? Thanks in advance.

Links to the full source code:

http://pastebin.com/2XftHtn9

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1 Answer

  1. Editorial Team

    Are you trying to connect to your own server using its public IP address from inside your LAN? For most SoHo routers, port forwarding only works WAN-to-LAN, not LAN-to-LAN. What you’re looking for is called “hairpin NAT”, and many SoHo routers just don’t do it. To reach your server from inside your LAN, use its inside IP address, not its public IP address.

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