Hi Team, I have recently upgraded one of my server from Centos7.9 to Rocky 9.4. After upgrading the server, I get the below error if I try to ssh to the server from another CentOS 7.9 server. Unable to negotiate with xxx.xxx.xxx.xx port 22: no matching host key type found. Their offer: ssh-rsa,ss…

If you look at sshd.service in Rocky 9 – with: cat /usr/lib/systemd/system/sshd.service you should see that the service wants sshd-keygen.target and that in turn: Wants=sshd-keygen@rsa.service Wants=sshd-keygen@ecdsa.service Wants=sshd-keygen@ed25519.service In other words, the Rocky 9 system sh…

[image] scotts: upgraded one of my server from Centos7.9 to Rocky 9.4 One more thing: I do hope that by “upgrade” you do mean fresh install of Rocky 9, and not any dark magick.

I missed conectiva for its distro upgrade - and downgrade - versatility, just with apt4rpm (another best-of-breed over DidNotFinish). Wow, did that work a treat.

Are you sure you have an RSA key and that’s what you’re actually sending? From the server message, it clearly says it accepts RSA. Why don’t you just generate a new RSA key with ssh-keygen -t rsa and try that? On some systems, it defaults to Ed25519 so you need to explicitly set it to RSA. What is …

Ssh-rsa key algorithm not accepted in Rocky 9.4

Rocky Linux Help & Support

iwalker November 5, 2024, 12:40pm 4

One more thing to consider would be the key length of the RSA pubkey. I have seen servers reject if it wasn’t 2048 or higher. Perhaps it’s an old generated ssh-key that is too short?

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Ssh-rsa key algorithm not accepted in Rocky 9.4

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