X11 works locally but not from remote clients because DISPLAY is /tmp/...

I've used X11 plenty of times before, but not in a little while. Now, when I start X11 on two different accounts, the DISPLAY variable is /tmp/launch-*/org.x:0 . When I telnet to a remote host and set the DISPLAY variable to my hostname:0 (ie. graphe:0), xterm says it can't connect to the display.
If I set DISPLAY to localhost:0 and start a local xterm it complains too:
xterm Xt error: Can't open display: localhost:0
From scanning this forum, I believe this may have something to do with ssh, but on one of the accounts where I have this problem I don't even have ssh configured.
What's the deal?

ssh -X (or -Y) exports your local host DISPLAY environment over a secure ssh tunnel to the remote system, where it creates a local X11 port pointing at the remote end of the secure ssh tunnel, and it creates the DISPLAY environment variable to specify the secure tunnel port.
It is a much (MUCH) more secure way to use X11 than previous methods, speaking as someone that has been using X11 since the early '90s. I did it the xhosts way for years, but about 6 years ago, I switched over to ssh -X and have never looked back.
Oh yea, several of my machines are about 2,000 miles away (all inside the company network, but still a long way away).
Message was edited by: BobHarris

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X11 works locally but not from remote clients because DISPLAY is /tmp/...

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