Please confirm other friends in this network could connect to each other.
Please list your Windows version, and firewall software installed.
Hi, yes, they can connect to each other, and when I appear online (only after change the status to "Appear Offline" and then "Avaliable") they can see me and only see "Connecting..." not my IP.
SO - Windows 7 Professional 64 bits
Firewall - Windows firewall (when I turn the firewall off it the same thing happens)