How can my LAN-Chat work over INTERNET?

[clawsy]

I develop a chat (server and client) using Sockets. It's working on LAN but when I try to connect the client to the server using my public IP address it says it cannot connect to that address. For example: 192.168.1.66 is ok but 92.84.65.32 (public) is not, client cannot connect to this address. My address is public - a friend pinged my address successfully. You find everywhere examples and code for chat applications - but only over local network.
What's the problem? How can my chat work over the Internet? (I can post code if necesarry).
Please help me. I need this so much!

[sukatoa]

Try to test here if the modem forwards the request to your machine... if that port is closed

try to read and configure port forwarding in your modem

[clawsy]

Thank you! Indeed I tested it and all the ports I tested are closed... I have a router and a modem that I use. I tried to forward the port from router... but I couldn't. See here what settings I tried: http://www.coderanch.com/t/472724/So...t-working-over

[sukatoa]

try to set it up again, (experiment)

an updated private IP address
use port from 3000+ and above

if you use Socket Type=TCP, if you use DatagramSocket Type=UDP

public port = private port
No comment
Enable

Save the settings
Reboot your router for 10 seconds
Unplug the utp cable/disable wireless device for 10 seconds, and connect it again...

try to observe if it is working.