On 12/13/23 01:44, Segher Boessenkool via cfarm-users wrote:
   PubkeyAcceptedKeyTypes +ssh-rsa
   HostKeyAlgorithms +ssh-rsa

in the host-specific part of .ssh/config, so the most immediate issue is
solved.
I also use
        KexAlgorithms +diffie-hellman-group-exchange-sha1
for some old machines.  But that's the way to go yes.

Thanks for letting us know about the ssh options. I often run into this problem when connecting to cfarm*.

One little complication is that OpenSSH 8.5 (2021-03-03) renamed PubkeyAcceptedKeyTypes to PubkeyAcceptedAlgorithms, though the old name still works as an alias.

Come to think of it, cfarm users would benefit if <https://portal.cfarm.net/machines/list/> covered this issue. That is, it'd be nice to have a column that somehow answers the question "If I'm running the latest OpenSSH, what options do I need to connect to cfarmNNN?" Or perhaps the info could be put into the "Show ssh config" button output.
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