There are already at least two similar threads on SU both having either outdated answers or answers that suggest using GUI.

Thus the following programs are NOT what I'm looking for:

• wkillcx - that looked like the right option but unfortunatelly it doesn't work either locally (WinServer 2008 and it's even worse via telnet - it shows only first line of the stdout and repeats it 3 times). It's written in assembly so it's even difficult for me to look into, perhaps the server is running not the processor that author assumed it will be running?
• tcpview (sysinternals) - this requires GUI, the cmdline part of tcpviewcon does not support killing connections
• CurrPorts - this program claims to support cli but what it actually does is it runs GUI part with arguments (i.e. you can start GUI with some filters), I don't see how that's "supporting cli" - again, it wont work via telnet
• kill the PID! -- No!