Berkeley CSUA MOTD:Entry 22544
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2025/04/03 [General] UID:1000 Activity:popular
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2001/9/20 [Computer/SW/Security] UID:22544 Activity:very high
9/20   A problem for you:  Tom is NATed behind a firewall.  He SSHes out to a
       remote machine which is ALSO NATed and behind a firewall.  (the remote
       FW has a redirect to the remote internal machine which is how he can
       ssh to there).   Tom would like to run an X-term on the remote machine
       and have it (tunnled through ssh obviously) display on his local machine.
       Assuming he has root on the remote box and his box, but that any access
       to either firewall (especially the remote one) involves painful red-tape,
       What is the easiest way for tom to accomplish his objective.
        \_ "X11Forwarding yes" in your sshd_config and use "ssh -X" to
            get to machines.
                \_ Error: Can't open display:
        \_ chances are your error is unrelated to the NATing.
           \_ I agree with my esteemed collegue.
           \_ It is more likely due to your broken ass boxes
           \_ Indeed.  If you can ssh successfully, it can forward X.
ERROR, url_link recursive (eces.Colorado.EDU/secure/mindterm2) 2025/04/03 [General] UID:1000 Activity:popular
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        \_  Oh, and http://irc.CSUA.Berkeley.EDU is online again.
	...