One time passcode (OTP) doesn't work in headless. Turn it off when starting up a headless instance, then turn it back on afterwords. Consider joining the #tech-support channel inDiscordfor help from the community if these common fixes don't help. ...
One of the simplest means of implementing a cryptographic port knock is by using a one-time-password system (otp or s/key). Such a system has been implemented in COK, which is trivially extensible, and flexible enough to be useful in a production environment, which will allow for port-...