Hi Dmitry,
thanks for your (fast) reply.

>First, ensure that "papo" is being resolved into IP address. If no, use directly IP addresses (like "192.168.1.1") or add appropriate line into hosts file or ... (there are many choices including DNS serveres etc, but they're not so important for you now).

I've got IP adress from DHCP server (winipcfg - IP address). I will use only
IP address (our DNS server know nothing about "papo").

>Second, you can check proper work of server by connecting to it's port from telnet.exe
>Third. Actually I'd recommend you to begin with localhost address (127.0.0.1). It is loopback address and you can debug your TCP/IP applications having only one computer wit network adapter.

From telnet.exe it works. (Address 10.1.220.1 or 127.0.0.1, port 2001)
From second form, no.

Pavel