NetScaler : How to create a custom SSH banner

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Instructions

The default banner is a warning that is enclosed in "#########" that states only authorized users must access the system.

You can customize this message for CLI only by performing the following:

1. Login to CLI.
2. Go to shell,
3. Add your customized message in the "/nsconfig/issue" (for console) and/or "/nsconfig/issue.net" (for SSH) files.
4. Reboot the appliance, as this will load it to the 'running config'  or copy the modified files to the "/etc/" directory

To perform this customization for GUI:

1.  Login to the ADC via CLI
2.  Go to Shell
3. Run the below command to got to nsconfig directory.
   • cd /nsconfig/ 
4. Run the below command to create a file under nsconfig directory.
   • touch motd
5. After this you can login ADC using winscp
6. Go to /nsconfig/ directory.
   • Edit  the 'motd' file.
   • Add required banner in motd file.
   • Save the file
7. Return to ADC CLI and run the below command one by one under shell
   •  ln -s /nsconfig/motd /etc/motd
   • echo "ln -s /nsconfig/motd /etc/motd" >> /nsconfig/rc.netscaler

After that, the GUI will also display the performed changes

These commands have to executed on both the ADCs separately if ADC's are in HA.
Note: If you want to simply modify the existing message, you can copy the relevant file from the "/etc/" directory to the "/nsconfig/" directory, modify it, and then upload it to the "/etc/" directory.

Important: If you do not want any banner, make sure the files exist but have no content.

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This article provides instruction on how to create a custom SSH banner.