On 30/06/2025 11:41, Jochen Bern wrote:
I'd like to change .ssh/config so that when muscle memory does a "ssh
too-old-host" again, I get output to the effect of "use the 'foo bar
baz' command instead" (and ideally, OpenSSH itself does not even
*attempt* to connect).
...
Is there an .ssh/config trick to that effect that I don't see?
You could abuse a text config setting, like
Host foobar
Hostname ": You should use ssh -O PubkeyAcceptedAlgorithms=+ssh-rsa"
which gives me:
% ssh foobar
ssh: Could not resolve hostname : You should use ssh -O
PubkeyAcceptedAlgorithms=+ssh-rsa: nodename nor servname provided, or
not known
Or BindInterface:
% ssh foobar
getifaddrs: You should use ssh -O PubkeyAcceptedAlgorithms=+ssh-rsa: no
suitable addresses
getifaddrs: You should use ssh -O PubkeyAcceptedAlgorithms=+ssh-rsa: no
suitable addresses
Although of course, if that were the problem, you could simply apply the
fix instead:
Host foobar
PubkeyAcceptedAlgorithms +ssh-rsa
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