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With FIPS enabled, SSH using public key authentication unexpectedly prompts for password

Last Updated:

Applies to

  • ONTAP 9.3 and later
  • Federal Information Processing Standard (FIPS)
  • Public key authentication


  • Unexpected password prompt for account using publickey authentication.
  • FIPS recently enabled.

Logs seen in "ssh -vvv" output on Linux-client side:

[root@... ~]# ssh -vvv user@x.x.x.x
debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/user
debug3: sign_and_send_pubkey: RSA SHA256:<key>
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51                    ---Packet type 51 indicates SSH user authentication failure     

Logs in /mroot/etc/log/messages.log:

[daemon_xinetd:info:6650] START: ssh pid=97704 from=::ffff:<client_ip> vsid=-1 role=0x20
[auth_sshd:info:97704] mm_answer_pwnamallow: Got passwd creds user (username), homedir (/var/home/username), uid (1008) from FILES
[auth_sshd:error:97704] error: get_socket_address: getnameinfo 4 failed: hostname nor servname provided, or not known
[auth_sshd:info:97704] userauth_pubkey: key type ssh-rsa not in PubkeyAcceptedKeyTypes [preauth]
[auth_sshd:info:97704] Connection closed by <client_ip> port ##### [preauth]
[daemon_xinetd:info:6650] EXIT: ssh status=255 pid=97704 duration=28(sec)


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