Xclock issue: Error: Can't open display Fixed

Dear DBA-Mates,

Hope you all are Good and Safe, also may have taken Covid-19 Vaccination which is very important.

We would like to share Xclock issue: Error: Can't open display xclock display error which we need to fix for display during Oracle Database/Application software installation as GUI.

Below are some important points and steps which may useful to all. This is very easy and simple steps but sometimes it will be headache to us…

Xclock issue: Error: Can't open display

XCLOCK Fix:

Below are the Pre-checks/pre settings:

1.   We need to start Xming software.

2.   We need to enable X11 in putty as shown below path:

Open putty à SSH à X11 à X11 Forwarding (Tick Mark “Enable X11 forwarding”)

X display location : “:0.0”

3.   Echo $DISPLAY – should give output

4.   Below rpms should be installed:

1. libXaw-1.0.13-4.el7.x86_64.rpm

2. xorg-x11-apps-7.7-7.el7.x86_64.rpm

5. If still not working then we can add xauth list as shown below:

[oracle@linux dbhome_1]$ xclock

Error: Can't open display:

[oracle@linux dbhome_1]$ echo $DISPLAY

 

[oracle@linux dbhome_1]$ export DISPLAY=localhost:11.0

[oracle@linux dbhome_1]$ xclock

PuTTY X11 proxy: Authorisation not recognised

Error: Can't open display: localhost:11.0

[oracle@linux dbhome_1]$ xauth list

linux.oracle.com/unix:16  MIT-MAGIC-COOKIE-1  ea8443005780edfb76f6930b20d4802c

linux.oracle.com/unix:11  MIT-MAGIC-COOKIE-1  80eab308a9f45535b261e1bf999d475e

linux.oracle.com/unix:13  MIT-MAGIC-COOKIE-1  3bbf11afe24f078bae5f55ae9145ca64

linux.oracle.com/unix:14  MIT-MAGIC-COOKIE-1  abc18e54fd548ccec81649f300a6a1af

linux.oracle.com/unix:15  MIT-MAGIC-COOKIE-1  2a03c3a4cc9c52f41b6fd13878194c0e

linux.oracle.com/unix:12  MIT-MAGIC-COOKIE-1  e7b5657526c2481dbfee1e0599496013

linux.oracle.com/unix:10  MIT-MAGIC-COOKIE-1  1ee8aec7489a11e0cb89a93734ccc19c

[oracle@linux dbhome_1]$ pwd

/u01/DB18C/oracle/product/18.0.0/dbhome_1

[oracle@linux dbhome_1]$

[oracle@linux dbhome_1]$ echo $DISPLAY

localhost:11.0

Note: If xclock is working with root but not working with oracle user then also we can take xauth list from root user and export the display as per root user and add the xauth list in oracle user from root user.

Below is the step to add the xauth list:

[oracle@linux dbhome_1]$ xauth add localhost.localdomain/unix:10  MIT-MAGIC-COOKIE-1  15779b706bb1daf925ad02323df4fda3

[oracle@linux dbhome_1]$ xauth add localhost.localdomain/unix:11  MIT-MAGIC-COOKIE-1  542175afd02f0cc7d5f9fe27c43321d4

[oracle@linux dbhome_1]$ xauth add linux.oracle.com/unix:10  MIT-MAGIC-COOKIE-1  94eb4e7f6c702d2e962a3e2cbf727dc8

[oracle@linux dbhome_1]$ xauth add linux.oracle.com/unix:11  MIT-MAGIC-COOKIE-1  21ad871e3931d34b963988874a232d0d

[oracle@linux dbhome_1]$ xclock

Warning: Missing charsets in String to FontSet conversion

^C

[oracle@linux dbhome_1]$

Hope above steps are easy and helpful. Kindly let us know for any concerns and will try to give some more inputs.

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