OpenSSH 10.1 에서 새로운 ssh-config 옵션 RefuseConnection 이 추가되었다고 한다.

ssh(1): add an ssh_config(5) RefuseConnection option that, when encountered while processing an active section in a configuration, terminates ssh(1) with an error message that contains the argument to the option.

This may be useful for expressing reminders or warnings in config files, for example:

  Match host foo
           RefuseConnection "foo is deprecated, use splork instead"

-- https://www.openssh.com/releasenotes.html#10.1p1

아니… 그것 참… 유용한 듯하면서도… 그것 참…