XK0-006 · Question #76
An administrator has generated an RSA SSH key pair to log in to a remote server. After copying the public key and attempting to log in, the administrator sees the following message…
The correct answer is B. Create a new key pair by running ssh-keygen -t ecdsa. The “no mutual signature algorithm” error means the RSA/SHA-1 key type (ssh-rsa) isn’t supported by both client and server. Generating a new key with a modern algorithm (e.g., ssh- keygen -t ecdsa) ensures a mutually supported signature method.
Question
An administrator has generated an RSA SSH key pair to log in to a remote server. After copying the public key and attempting to log in, the administrator sees the following message:
[email protected]: Permission denied (publickey,password) After seeing the message, the administrator attempts to connect using ssh -v [email protected] and notices the following debug output:
debug1: send_pubkey_test: no mutual signature algorithm Which of the following actions should the administrator take first to remediate this issue?
Options
- AIssue systemctl restart sshd on the local server.
- BCreate a new key pair by running ssh-keygen -t ecdsa.
- CSet PermitRootLogin yes in the /etc/ssh/sshd_config file.
- DUpdate permissions on the /home/admin/.ssh directory to 700 on the remote server.
How the community answered
(56 responses)- A9% (5)
- B64% (36)
- C23% (13)
- D4% (2)
Explanation
The “no mutual signature algorithm” error means the RSA/SHA-1 key type (ssh-rsa) isn’t supported by both client and server. Generating a new key with a modern algorithm (e.g., ssh- keygen -t ecdsa) ensures a mutually supported signature method.
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