So I went to try and remote run an xterm from a machine I had not turned on for a while…
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~$ ssh -X me@somehost ... ~$ xterm |
And unexpectedly received the following error message:
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xterm Xt error: Can't open display: xterm: DISPLAY is not set |
After some scratching around I found the following error message in /var/log/auth:
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sshd error: Failed to allocate internet-domain X11 display socket. |
After more had scratching and reading the sshd_config manpage, I remembered I often turn off ipv6 on test machines on my local network (yes, I know…) This doesn’t always play well with default configs of a lot of software, including ssh. Enabling the following setting in /etc/ssh/sshd_config resolved the problem:
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AddressFamily inet |