I was recently trying to install oracle. I added a new user and could not start any x-windows as this new user. “xhost +” was the solution.
The following error was displayed:
====
oracle@manoj:/home/oracle/database$ xclock
No protocol specified
Error: Can't open display: :0.0
=====
The solution is below:
Run "xhost +" via root:
=====
root@manoj:/home/oracle/database# xhost +
access control disabled, clients can connect from any host
OR
You can also run the below command:
=====
root@manoj:/home/oracle/database# xhost local:oracle
access control disabled, clients can connect from any host
=====
Now, login as oracle user and try to run "xclock".
=====
root@manoj:/home/oracle/database# su oracle
Now it should work:
oracle@manoj:/home/oracle/database$ xclock
======
ONLY FOR FURTHER REFERENCE:
-----------------------------------------------
Note: If xclock command is not found in the server. Install it using yum as below:
=====
yum install xorg-x11-apps
Also, to set the display variable use the below command.
DISPLAY=:0.0
export=DISPLAY
======
The following error was displayed:
====
oracle@manoj:/home/oracle/database$ xclock
No protocol specified
Error: Can't open display: :0.0
=====
The solution is below:
Run "xhost +" via root:
=====
root@manoj:/home/oracle/database# xhost +
access control disabled, clients can connect from any host
OR
You can also run the below command:
=====
root@manoj:/home/oracle/database# xhost local:oracle
access control disabled, clients can connect from any host
=====
Now, login as oracle user and try to run "xclock".
=====
root@manoj:/home/oracle/database# su oracle
Now it should work:
oracle@manoj:/home/oracle/database$ xclock
======
ONLY FOR FURTHER REFERENCE:
-----------------------------------------------
Note: If xclock command is not found in the server. Install it using yum as below:
=====
yum install xorg-x11-apps
Also, to set the display variable use the below command.
DISPLAY=:0.0
export=DISPLAY
======
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