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I'm sshing from a ubuntu 14.04.1 machine into a ubuntu 14.04.3 remote machine with -X. Usually the X11 forwarding just works. But it does't on this machine. Error message:

$ eog
** (eog:7733): WARNING **: Could not open X display

$ echo $DISPLAY
localhost:12.0

However, it works when I add sudo:

$ sudo eog

More information about the remote machine:

Kernel: 3.19.0-25-generic

SSH client settings /etc/ssh/ssh_config:

 ForwardX11 yes
 ForwardX11Trusted yes

SSH server settings /etc/ssh/sshd_config:

 X11Forwarding yes

Does anyone know what could be the cause? Or should I be looking into the config on my local machine instead?(which also has X11 enabled)

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Check is any of the .files in the home is owned by root (.Xauthority might be a good candidate). If the files are owned by root, try to chwon them or delete them.

Check all the files, usually only your user should own files in your home.

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  • I checked the Xauthority. It is owned by my own user: rw------- 1 myuser myuser 108 Nov 16 14:14 /home/myuser/.Xauthority. Is there any other file that I should check? Thanks
    – vincent_zhang
    Commented Nov 16, 2016 at 21:47

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