Port knocking is not really “just a bad password”, as long as you are using it in conjunction with another secure service like SSH. However, you can get the sa

Port knocking is not really “just a bad password”, as long as you are using it in conjunction with another secure service like SSH. However, you can get the same effect as port knocking with none of the drawbacks using single packet authorization like fwknop if you don’t want to go full VPN.