Yes nc 23 http://www.freechess.org
so that port is blocked.
But the usual telnet connection ports for that server are 5000 and 23 and they are
tried in that order by any chess client that connects to it. . It is port 5000 that usually works.
It does not in Debian Mint.
However all is well in standard Mint 10(Ubuntu) which I am now using
and I am now connected on port 5000 so obviously port 5000 is not blocked by our router.
So how to enable port 5000 for telnet in Debian Mint
would be the next question.
Really I think the user should not have to go through such hassles(yes I know this is linux)