Hide Linux Distro from SSH connections on Ubuntu

If you want to hide Linux Distro in SSH Daemon when someone does telnet to port 22 or run ssh in verbose mode like below

# telnet 0 22
Trying 0.0.0.0...
Connected to 0.
Escape character is '^]'.
SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3

Simply add DebianBanner no in /etc/ssh/sshd_config

and restart sshd daemon.

# telnet 0 22
Trying 0.0.0.0…
Connected to 0.
Escape character is ‘^]’.
SSH-2.0-OpenSSH_7.6p1

But you can’t hide OpenSSH_7.6p1. To hide openssh version, you need to change OpenSSH source code and compile openssh again.

Ismail YENIGUL