Socket C# - Local Ip works, but Internet IP do not work

Guys, i implemented a Socket with Client and Server side. When I use my local IP (192.168...) it works. But when I put the Inte开发者_JS百科rnet IP, it doesn't work! What's the main causes for that please?

Thank you

You have a firewall or NAT device between you and the internet.

You should forward your port in your router.