When ‘ssh -X somehost’ doesnt work…

Nov 24 2012 Published by under howto, tech

So I went to try and remote run an xterm from a machine I had not turned on for a while…

And unexpectedly received the following error message:

After some scratching around I found the following error message in /var/log/auth:

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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