Trying to get a java program that sends small messages (believe they are called "datagrams"??) to my computer. The program I am trying to use must be started in a DOS Prompt/Command Prompt and it uses TCP and UDP ports to send and receive messages/datagrams. The problem: We can not get it to work on our machine running Win ME or the machine running Win XP, but it will run on the machine running Win98SE. All machines are connected to the same Linksys router. Question: What is it in Win ME or Win XP that could be blocking these messages from coming in? We are using TCP port 1500 and UDP port 1500, but this program can use any port number over 1000. Is there something in these two versions of Windows protecting these ports and keeping these messages from coming in? It appears we are able to connect to the remote Hub/Server, but we cannot receive the messages from the remote hub/server, so we can get out, but nothing will come in. Any ideas on what to turn off or on that might open these ports up or etc to block this possible security issue with the ports? BTW... we are NOT using WinXP's Firewall (it is off) or any other firewall and not using XP's ICS Thank you! The RayBan PS. I installed the java 2 runtime environment on all three machine (XP, Me and Win98SE machine) and the XP and ME machine still would not allow messages in, but the Win98SE will. Just don't get it??? Thanks again!