I have made a network game use splay. but when the 5-6 player join, some player will often receive DPSYSMSG_SESSIONLOST, i dont know which reason will produce this Msg, Is sessionhost send this Msg? I think may be on of follow reason : 1.I use "DPSESSION_KEEPALIVE" flag when create session, this made many sessionlost msg. 2.i use peer-peer mode, and the rate is Send rate is ~500Byte/s Receive rate is ~500Byte/s when 4 player join. 3.our local network is not good enough? Who can help? i also want ask: in network game , what send or receive rate is receiveable?