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Step 8: Enabling GUI Access for DBCA – X11 Forwarding

Sometimes, clicking is better than typing—especially when you're setting up a database and prefer a mouse over a terminal. If that sounds like you, let’s get DBCA (Database Configuration Assistant) running with a full graphical interface using MobaXterm.

No extra fuss with Xming or PuTTY—MobaXterm does it all, like a well-trained cat fetching socks (okay, maybe not that magical, but close).

Install X11 on Linux

1) Enable the CodeReady-builder repository

Install the needed packages. This will pull also multiple required dependencies:

Install GUI packages on your Linux server

Login as opc user:

type: xauth list


Switch to the oracle user:


Add entire output using “xauth add” command:




Install and Launch MobaXterm

Configure SSH with X11 Forwarding

In the session settings:

  • Remote host: your server’s IP or hostname
  • Check “Specify username” and enter your Linux username (e.g., oracle or youruser)
  • Under X11 Forwarding, make sure “X11-Forwarding” is checked

Then click OK and connect. MobaXterm automatically handles the X server part—no need for a separate tool like Xming!


Steps to Enable Direct SSH Login for the oracle User

  • Set a password for the oracle user.
sudo -s
passwd oracle


Allow login for the oracle user in SSH config

Open the SSH config file:

/etc/ssh/sshd_config

AllowUsers oracle opc, Check or add the following line (if it's missing):

Check or add the following line (if it's missing):

Check or add the following line (if it's missing):

AllowUsers oracle opc

If AllowUsers is already set but does not include oracle, add it.

Also make sure these options are set (or uncommented):

PermitRootLogin no
PasswordAuthentication yes






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