If you get error messages like this

Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

xhost:  unable to open display ":0.0"

when running a program, you probably need to add the user to the X server access list.

You can add a user to the X server access list with

# xhost +local:username

This allows "username" to connect to the local running X server.

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Xlib: connection to ":0.0" refused by server(openSUSE)