https://bugzilla.mindrot.org/show_bug.cgi?id=3881

Darren Tucker <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #1 from Darren Tucker <[email protected]> ---
(In reply to Dan Jacobson from comment #0)
[...]
> To resolve this, you just need to refresh the stored host key on your
> computer. Run the command ssh-keygen -R jidanni.org to remove the
> outdated key, then connect again with ssh -vv jidanni.org and accept the
> new ED25519 key when prompted.

That's not particularly good advice: when you reconnect the first time
after deleting the host key you are vulnerable to a MITM attack.  They
should at least provide a secure method of verifying the new host key,
or...

$ telnet jidanni.org 22
Trying 69.163.177.88...
Connected to jidanni.org.
Escape character is '^]'.
SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.13

That version has the UpdateHostKeys option (it was introduced[0] in
8.6) that allows the client to learn new host keys in a secure manner. 
Since this didn't happen presumably it's disabled in either the client
or server?

[0] https://www.openssh.com/releasenotes.html#8.6

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