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I'm sshing into a remote host and it's picking gssapi-with-mic authentication. How do I set at command line to only use public key? I don't have access to the remote server's /etc/ssh/sshd_config and it seems all the recommendation is for changing the config rather than command line option.

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2 Answers 2

Reset to default
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That should be with:

ssh -o PreferredAuthentications=publickey host

The default value of PreferredAuthentications according to the manual is: gssapi-with-mic,hostbased,publickey,keyboard-interactive,password.

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You can try something like:

ssh -o " AllowedAuthentication=publickey" -i path/to/private_key username@hostname

For the record your private key is located (usually) in ~/.ssh directory

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    From the manual, I'm not convinced it would cause publickey auth to take precedence over gssapi-with-mic. It would rather bypass the authentication agent.
    – Stéphane Chazelas
    Sep 26, 2021 at 11:50

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