The error message in the authentication log indicates that the SSH client is trying to use a public key file for authentication, but the file is not a certificate. The key type ssh-rsa is a traditional SSH public key type, while certificates are a more modern and secure way to authenticate with SSH.
There are a few possible reasons why the client might be trying to use a public key file instead of a certificate:
The client is outdated and does not support SSH certificates.
The server is not configured to accept SSH certificates.
The user has explicitly configured the client to use a public key file.
If you are using a modern SSH client and the server is configured to accept SSH certificates, then it is recommended that you switch to certificate authentication. This is more secure and easier to manage.
To switch to certificate authentication, you will need to generate an SSH certificate and install it on the server. You can do this using the following commands:
Once you have installed the certificate on the server, you can connect to it using the following command:
ssh -i id_rsa_cert.pub root@server_ip
If you are unable to switch to certificate authentication, then you can work around the error message by explicitly configuring the client to use the public key file:
The error message in the authentication log indicates that the SSH client is trying to use a public key file for authentication, but the file is not a certificate. The key type
ssh-rsais a traditional SSH public key type, while certificates are a more modern and secure way to authenticate with SSH.There are a few possible reasons why the client might be trying to use a public key file instead of a certificate:
If you are using a modern SSH client and the server is configured to accept SSH certificates, then it is recommended that you switch to certificate authentication. This is more secure and easier to manage.
To switch to certificate authentication, you will need to generate an SSH certificate and install it on the server. You can do this using the following commands:
Once you have installed the certificate on the server, you can connect to it using the following command:
If you are unable to switch to certificate authentication, then you can work around the error message by explicitly configuring the client to use the public key file:
However, it is important to note that this is less secure than using certificate authentication.
Which method you choose will depend on your specific environment and requirements. If you are unsure, please consult with your system administrator.
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