I am programing a MMORPG, The program is using DirectX 8.1 / Directplay. I sent the info for each enemy in a message that its size is 18 bytes. 1 message is sent for each animal each cycle ( 250 ms )sometimes there are 10-20 animals that need to be sent. This work pretty solid with broadband. But when i am using Dial-up conection ( 56.6k modem ) there is a 70% Messages lost with more than 3 animals. This is the code i use to send the messages to the clients. DPNHANDLE hAsync; g_pDPServer->SendTo( dpnidPlayer, bufferDesc, 1, 250, NULL, &hAsync, DPNSEND_NONSEQUENTIAL | DPNSEND_NOLOOPBACK | DPNSEND_GUARANTEED ); I already tried : - Reduce the message ( it sized 32 bytes ) - Send no more than 4 messages each cycle - Clear the queue of messages each cycle using "CancelAsyncOperation" - Set different "time out" timer - Using diferent combinations of flags. I wonder if i can get some help here. Tnx in advance for ur time reading, hope u can help me.