Xlib: connection to

Xlib: connection to ":0.0" refused by server
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Solution:
usr A -- login user
usr B -- su user
As normal user, you can run:

xhost local:B

and then this user will be able to open x programs. You can edit B's .bashrc and add the following line:

export XAUTHORITY=/home/A/.Xauthority

After editing /home/oracle/.basrc, you won't have to issue the command "xhost local:B" anymore after X starts.