It's much more looks like Bug#16779 "Recieving Data Bug", but today i stuck on "waiting for host" and after few minutes i have being kicked.
Ports udp 2302-2305 are opened, connection type L2PT, MTU=1400, location - russia, provider - Freedom, OS - Win 7 x64, using steam and have CO & RFT
UPDATE: Thank you very much for helping, the problem has solved! I've found recently released (1 week ago) drivers for my Zyxel Keenetic lite, and it's seems worked now!