How do I enable SSHD to listen on an IPv6 address?
To enable IPv6 on a Linux server’s SSH, edit the /etc/ssh/sshd_config file. Look for ListenAddress, Then uncomment the #ListenAddress :: line.
#ListenAddress :: line.
ListenAddress 0.0.0.0 ListenAddress ::
This will bind sshd to every address on your machine.