Java Socket Programming

Question

Java Socket Program did not work for WAN

I have written a TCP IP socket program which works fine in my LAN. One of my friend is at bangalore He ran the server and I ran the client with the host name of my friend's IP. In this case my socket program did not work.

Answer 1

You said that your program is attempting to connect to host 192.168.1.107 port 46216.

192 prefix specifies it is a class C address and is private. Making your program connect to that will force it to remain on the local network searching for that node. You will need to find the IP address of your router (you can use http://whatismyip.org/ to find this out). Then go into your router settings and forward port 46216 to 192.168.1.107 (your node), or even better, your MAC address which is not subject to change (in case your router is running DHCP).

on a side note, it isn't good to hardcode IP addresses. Simply use a textfield to avoid having to redistribute the client when your IP is changed, as it is likely you have a dynamic IP from your ISP.