Description of problem: I run some headless machines on my LAN and typically telnet or ssh to them and redirect the DISPLAY back to my desktop. This always worked fine with RH7.3, but apparently doesn't after my recent RH9 upgrade. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. xhost + on my desktop machine (192.168.0.3) 2. telnet to the remote machine (192.168.0.5) 3. export DISPLAY='192.168.0.3:0.0' 4. try opening an X-app on my desktop - e.g. xclock 5. get "Error: Can't open display: 192.168.0.3:0.0" 6. xclock -display 192.168.0.3:0.0 fails on 192.168.0.5 but works on 192.168.0.3 Actual results: Get X permission error Expected results: X window should open on my desktop Additional info: I have also try explicitly granting the remote machine in question X permissions using xhost instead of the much more permissive xhost + but with the same results.
By default in Red Hat Linux, sshd is configured to permit X11 forwarding between hosts. You just ssh to a host and run an X11 application with no configuration required. No need to use xhost or xauth at all. TCP is also disabled by default (and always has been). I don't see any reason why you'd want to forgo the X11 forwarding built into ssh and do things the ancient way, but if you want to you can reconfigure things to do so. For assistance with that, ask on one of our mailing lists, but I strongly recommend just using native default X11 forwarding as it is completely painless, and just works out of the box, plus all of your traffic is encrypted for free. Closing as NOTABUG