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On Server B, I have ECDSA, RSA and ED25519 private and public keys available in /etc/ssh/.

When server A tried to ssh to Server B it received the RSA key fingerprint to authenticate and fails because in its known_hosts it has Server B's ECDSA key fingerprint not the RSA key's, and strict key checking is enabled.

I cant make changes to Server A, on Server B I can. So how can I make Server B present ECDSA key to any server in this case Server A when they try to connect through SSH? Or in other words make ECDSA the default key identity for Server B instead of RSA?

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Can you check on Server B that it can use ECDSA keys (in /etc/ssh/sshd_config should be uncommented) :

HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
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  • Yes, these lines are present in sshd_config and uncommented.
    – Nullpointer
    Commented Mar 7, 2023 at 0:56

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