Normally, when I'm logged into a remote machine and want the
display to display to my machine, I use xhost to add the remote
machine to the list of authorized machines and export DISPLAY
on the remote machine to be my machine.

Today, I noticed that on both of my gentoo machines (one laptop and
one desktop) this doesn't seem to work. For example, if I do
'xhost 127.0.0.1' and 'export DISPLAY=127.0.0.1:0' and then
try to run xclock, nothing happens for about 6 seconds and then
I receive the error message: "Error: Can't open display: 127.0.0.1:0"

Running nmap against both machines reveals that X11 isn't listening
on the usual port (6000?). Did I fail to configure X correctly or
is there some step I still need to take in order to use my gentoo
machines as remote X display?

Any help will be appreciated.

--Dan