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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

    Deepak Prasad

    Deepak Prasad is an anonymous techie and an author who is still trying to survive in this IT generation with very little knowledge he has on Linux/Unix, VMware, SAN Storage, Automation, networking etc

    You can follow him on Facebook or Google+

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    How to Fix "Xlib: No protocol specified" How to Fix "Xlib: No protocol specified" Reviewed by Deepak Prasad 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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