SSH
https://www.openssh.com/
https://www.openssh.com/manual.html
https://www.systutorials.com/docs/linux/man/5-ssh_config/
https://gnulinux.ch/ssh-debuggen
Generate SSH Key
Manage Via SSH Executable Commands
PuTTY-Konfiguration
Remote SSH Tunnel with autossh
SSH - check or kill master control process
Stronger SSH Key and keychain