==> messages <==
Apr 10 03:56:40 server sshd[21151]: rexec line 88: Unsupported option UsePAM
Apr 10 03:56:41 server sshd[21151]: Invalid user openssl from 174.142.85.17
Apr 10 03:56:41 server sshd[21151]: input_userauth_request: invalid user openssl [preauth]

==> syslog <==
Apr 10 03:56:41 server sshd[21151]: error: Could not get shadow information for NOUSER

==> messages <==
Apr 10 03:56:41 server sshd[21151]: Failed password for invalid user openssl from 174.142.85.17 port 57819 ssh2
Apr 10 03:56:41 server sshd[21151]: Disconnecting: Change of username or service not allowed: (openssl,ssh-connection) -> (ssl,ssh-connection) [preauth]