thank you for your replying I think my case is the most former one what I have to do if there is some problem to be able to get a route? On Oct 26, 2010 1:44am, Neil Van Dyke <neil@neilvandyke.org> wrote: > 김태윤 wrote at 10/25/2010 11:47 AM: > > > I want to make program that connect both computer and send and receive data. > > but my trying fails again and agian > > > > > There are a number of possible problems, including: > > > > * You might not be able to get a route, especially if a home router is doing NAT. Try traceroute to see if you can get a route all the way to your destination IP address. > > > > * Some ISP or firewall might be blocking the port number, or a home router might need to be configured to send that port to the desired machine. Try "telnet" to see if you can connect to the port manually. > > > > * If your second program exits, it might be exiting before it finishes the TCP protocol to send. > > > > -- > > http://www.neilvandyke.org/ > >