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  • How to Fix "Xlib: No protocol specified"

    While installing Oracle database I was getting this error. I searched various blogs and forums and
    found out many solutions but lastly I got one solution which worked for me.

    But well I will post all the possible ways which you can try (as per my knowledge) to overcome this issue.

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

    Specify the display protocol by logging into the user account you are getting the error

    Solution 1:
    $ export DISPLAY=localhost:0.0
    $ xhost +
    Solution 2:
    $ export DISPLAY=(machine_name):0.0
    For example:
    $ export DISPLAY=
    $ xhost +
    Solution 3 (which worked for me)
    Login to the user account where you are getting the above error

    $ xauth $DISPLAY
    xauth: creating  new authority file /home/oracle/.Xauthority
    xauth: (argv):1: unknown command ":0.0"
    The best way to check whether your Xlib display protocol is working or not is by using xclock command
    $ xclock
    After running this command you should see a small clock on your screen.

    Solution 4
    In case the above solution does not works
    Login as root
    # xauth $DISPLAY 
    xauth: creating new authority file /home/root/.Xauthority
    # xauth list $DISPLAY
    test.example.com/unix:0 MIT-MAGIC-COOKIE-1 f601e6a29ea688786765434c5c6325071
    Now copy the above output and su to the user you are facing issue
    # su - oracle
    $ xauth add test.example.com/unix:0 MIT-MAGIC-COOKIE-1 f601e6a29ea688786765434c5c6325071
    xauth: creating new authority file /home/oracle/.Xauthority
    Now test if your DISPLAY is working
    You should get a small clock output on the screen

    How to Fix "Xlib: No protocol specified" How to Fix "Xlib: No protocol specified" Reviewed by admin on Thursday, June 06, 2013 Rating: 5


    1. I really had to struggle alot for this error. Thanks to your blog finally came over it.

      For me Solution 4 worked. Thanks once again

    2. Thank you ,
      Solution 4 is working fine , others not working ;)


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