>> "Enter" then ~ then . will kill a hung SSH connection
> is this the same as hitting CTRL-D?
No. ^d is a character that is sent to the remote shell (bash, zsh, etc) to tell it to exit. ~. is something for the SSH client to tell it to cut the connect if (e.g.) the shell has hung.
Thing of it like working at different OSI layers: ^d is HTTP, while ~. is like TCP or IP.
> is this the same as hitting CTRL-D?
No. ^d is a character that is sent to the remote shell (bash, zsh, etc) to tell it to exit. ~. is something for the SSH client to tell it to cut the connect if (e.g.) the shell has hung.
Thing of it like working at different OSI layers: ^d is HTTP, while ~. is like TCP or IP.