[LINUX] Measures to be taken when "Cannot open display" is displayed in X11 Forward

Nyan

At the client

ssh -X [email protected]
xeyes
Cannot open display: :0.0

: telephone :: cat: <Why ...

Is it because the server doesn't have xauth?

Reference: http://luozengbin.github.io/blog/2014-06-21-[Note] Remote x connection method.html

On the server (Ubuntu)

sudo apt install xauth
xauth list
hoge/unix:0  MIT-MAGIC-COOKIE-1  72kuxtu334nandeya

If you restart the server after this, xeyes will probably pass.

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