Ok, apparently it wants an elliptic curve key. It never used to accept
anything but DSA and RSA. So I made an ecdsa keypair and ssh-copy-id
to the TB. Same failure. I know that X2Go can't handle ed25519
unfortunately, so I don't even have that key for my user.
When setting the Pyhoca session SSH key manually to
/home/bill/.ssh/id_rsa or /home/bill/.ssh/id_ecdsa, I get, "Not a valid
EC private key file!"
When not setting the Pyhoca session SSH key either way, and password is
allowed on the TB server, it comes up with a dialog box asking for
password, and when I enter the correct one I get, "Authentication
Needless to say, all three methods work on the commandline.
Showstopper because I can't configure wifi without NetworkManager and
NetworkManager requires a GUI, and this machine is headless.
Researched this to the ends of the Earth, but the issues were X2Go from
a Windows client (I'm CentOS), a permissions problem on keys or .ssh,
or ssh_config forwarding was disabled. None apply here.