а с такими нужно смотреть, какие типы ключей они понимают
Да кажется стандартная аутентификация по ключам:
debug1: Authenticating to 172.16.x.x:22 as 'noc'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: diffie-hellman-group1-sha1
debug1: kex: host key algorithm: ssh-dss
debug1: kex: server->client cipher: aes128-cbc MAC: hmac-sha1 compression: none
debug1: kex: client->server cipher: aes128-cbc MAC: hmac-sha1 compression: none
debug1: kex: diffie-hellman-group1-sha1 need=20 dh_need=20
debug1: kex: diffie-hellman-group1-sha1 need=20 dh_need=20
debug1: sending SSH2_MSG_KEXDH_INIT
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug1: Server host key: ssh-dss SHA256:EC42A8jc6GSz+34hxx1drugXXAxxD4+rm5iMxxuxxjo
debug1: Host '172.16.x.x' is known and matches the DSA host key.
debug1: Found key in /root/.ssh/known_hosts:8
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,keyboard-interactive,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: ./etc/noc_ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Authentication succeeded (publickey).
Authenticated to 172.16.x.x ([172.16.x.x]:22).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: pledge: exec
debug1: X11 forwarding requested but DISPLAY not set
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
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