if you are trying to login on port 2030 then you probably need to open it on your vps firewall
also check that cwpsrv works
# netstat -tulpn|grep 2030
tcp 0 0 0.0.0.0:2030 0.0.0.0:* LISTEN 16070/cwpsrv
it works if you get this output so then only firewall is left to be checked.