Is the failed connection attempt limit `3`, perhaps? I went back to my root heliohost username and sftp password, but my SFTP client (Panic's Transmit.app) kept trying to use an ssh key instead of the saved password. That required adding a block to my `~/.ssh/config`:
Host morty.heliohost.org
PasswordAuthentication yes
PreferredAuthentications password
IdentitiesOnly yes
IdentityFile /dev/null
But by the time I got that set, it was apparently too late again. 🤦♂️