The question comes to mind.
What happens when one of the three Indie Archive systems goes belly up.
Since I had just done a Debian install of the secondary system I pretended my secondary system crashed.
I removed it and replaced it with the Debian system.
Changed the IP.
ssh noticed. I redid the key transfer from the primary and remote systems (had to use -f first) and I checked that I could log in without a password.
And then it worked.
Disabled password in ssh.