ssh -v

• ssh -vvv USER@SERVER.COM 2>&1 | egrep "Authenticating to|Offering"

Debug1: Authentications that can continue: publickey,password

Errors

debug1: match: OpenSSH_8.3p1 Ubuntu-1 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 172.16.0.105:22 as 'USERNAME'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

Solution:

• ssh -o MACs=hmac-sha2-256 HOSTNAME

Troubleshooting:

• ssh -vvv USER@SERVER.COM 2>&1 | egrep "Authenticating to|Offering"

client_loop: send disconnect: Connection reset by peer

debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling

debug1: connect to address xx.yy.zz.tt port 22: Operation timed out

debug1: pledge: filesystem full

Related terms

• /etc/issue
• /var/log/auth.log
• sshd logs

See also

• OpenSSH (changelog): /etc/ssh/sshd_config | /etc/ssh/ssh_config | ~/.ssh/ | openSSL | sshd logs | sftp | scp | authorized_keys | ssh-keygen | ssh-keyscan | ssh-add | ssh-agent | ssh | Ssh -O stop | ssh-copy-id | CheckHostIP | UseKeychain, OpenSSF, ~/.ssh/authorized_keys