Hi Folks, A new question! (All this up-to-date Linux stuff is finding the gaps in my obsolete knowledge ...).
I'm currently trying (rather, wanting to try) running X apps remotely on one of my machines, with Gentoo running off the Live CD on the new laptop. So:
Current practice is by default for X servers NOT to listen on tcp port 6666 anymore. You may have to turn in on if you need it.
Peter