Steam bad company 2 multiplayer problem with steam

[Guest]

Hello, I just bought this game, the singleplayer mode works perfectly, but when I try to play online, It always say there is a connexion problem, what can i do to fix it pls

 

[jerreece]

First question: Can you connect online with OTHER Steam games?

This will help us determine if you simply have a network or configuration problem (antivirus, firewall issues, etc) or if it could possibly just be a Bad Company 2 problem.

Troubleshooting Network Connectivity Problems (for Steam)
https://support.steampowered.com/kb_article.php?s=cd93c0d36d10208d7e20f8953c6b59b7&ref=1456-EUDN-2493