Steps that are necessary to run DBCA via Xming (Flashgrid-enabled clusters)

1. Remove immutable flag from /etc/ssh/sshd_config file:

# chattr -i /etc/ssh/sshd_config

2. Change the following in /etc/ssh/sshd_config:

From:

#X11UseLocalhost yes

To:

X11UseLocalhost no

4. Readd immutable flag to /etc/ssh/sshd_config file:

# chattr +i /etc/ssh/sshd_config

4. Restart sshd service:

# systemctl restart sshd

5. Start Xming on your computer and reconnect to the server via putty with X11 enabled.

6. Check current DISPLAY settings:

$ echo $DISPLAY
192.168.1.2:10.0

7. Copy Xauthority file from fg to oracle

$ sudo cp /home/fg/.Xauthority /home/oracle/.Xauthority
$ sudo chown oracle:oinstall /home/oracle/.Xauthority

8. Switch to oracle user and export DISPLAY variable, assign the same value that was returned from fg user (from where you run sudo su – oracle):

$ sudo su – oracle
$ export DISPLAY=192.168.1.2:10.0

9. Run DBCA:

$ dbca