Hello, I'm trying to explore the basics of networking. Let me introduce my working zone: 2 PC (both with Windows XP, one with SP1 and the other with SP2), both connected to the same router.
I have been testing with some manuals and tutorials about winsock (also winsock2, but for the moment I use the synthax explained on winsock1), till I create a basic server and a basic client. On the same PC they work great, server listens on port 80, accept connections through 'INADDR_ANY', and client can connect to the server as 'localhost' or as '127.0.0.1' (the localhost IP, I think that's the localhost IP because there's only one aliases on the IP's aliases list). Till that point all is right.
But now I would like to run the server on a PC and the client on another: I'm right supposing that both 2 PC connected on the same router is a LAN? On the net connections attributes ('start->config->net connections->LAN connection', I'm not running english windows version , that's a literal translation so I suppose that the names will be similar) appears a tab control for the LAN compatibility, and it says
Code:
On PC #1
IP adress : 172.16.0.4

On PC #2
IP adress : 172.16.0.5

On both there's the same "subnet mask : 255.255.255.0" and the same "predefined bla bla (sorry, I' don't know how to translate that) : 172.16.0.1"
Well, now I run the server on PC #2 (that PC have SP2, and it says 'Would you like to block...?", I say "Don't block my server") I test in local mode with the client and it works, so I can confirm that the SP2 allow me to work with servers and clients.
On both PC's, when I run the server and client on the same PC, altought the IP adress is 172.16.0.x I should use the localhost IP that is 127.0.0.1 (for both PC's).

Finally I try to run the server on on PC #2, the client on PC #1, but it does not work. If I use the localhost IP (127.0.0.1, or whatever variant 127.0.0.x) the client gets an error 10061; if I try to connect the client to the IP adress of the PC#2 (172.16.0.5) I get an error 10060; if I try to connect to the subnet mask the error is 10049. I have the same errors if I run the server on PC #1 and the client on PC #2.

How can I solve that problem? Or where can I find more info about that?

Thank's in advance
Niara