if you follow these steps the game will work 100%
http://zlogames.ru/index.php?showtopic=2869
this problem with all server or it just happened with one server ?
if with one server only it will be because "Server uses ONLY game port(udp, from bat file) and pb port(dunno which), well and rcon(tcp, from bat), if you need it. No other ports need to be forwarded."