Running sshd on another port with maximum debug level:
$ sudo /usr/sbin/sshd -d -d -d -p 2222 > /vagrant/sshd-log 2>&1
changeing testserver port to 2222 and then calling:
$ /ansible testserver -m ping -v -v -v -v
yields:
debug2: load_server_config: filename /etc/ssh/sshd_config
debug2: load_server_config: done config len = 763
debug2: parse_server_config: config /etc/ssh/sshd_config len 763
debug3: /etc/ssh/sshd_config:5 setting Port 22
debug3: /etc/ssh/sshd_config:9 setting Protocol 2
debug3: /etc/ssh/sshd_config:11 setting HostKey /etc/ssh/ssh_host_rsa_key
debug3: /etc/ssh/sshd_config:12 setting HostKey /etc/ssh/ssh_host_dsa_key
debug3: /etc/ssh/sshd_config:13 setting HostKey /etc/ssh/ssh_host_ecdsa_key
debug3: /etc/ssh/sshd_config:14 setting HostKey /etc/ssh/ssh_host_ed25519_key
debug3: /etc/ssh/sshd_config:16 setting UsePrivilegeSeparation yes
debug3: /etc/ssh/sshd_config:19 setting KeyRegenerationInterval 3600
debug3: /etc/ssh/sshd_config:20 setting ServerKeyBits 1024
debug3: /etc/ssh/sshd_config:23 setting SyslogFacility AUTH
debug3: /etc/ssh/sshd_config:24 setting LogLevel DEBUG3
debug3: /etc/ssh/sshd_config:27 setting LoginGraceTime 120
debug3: /etc/ssh/sshd_config:28 setting PermitRootLogin without-password
debug3: /etc/ssh/sshd_config:29 setting StrictModes yes
debug3: /etc/ssh/sshd_config:31 setting RSAAuthentication yes
debug3: /etc/ssh/sshd_config:32 setting PubkeyAuthentication yes
debug3: /etc/ssh/sshd_config:36 setting IgnoreRhosts yes
debug3: /etc/ssh/sshd_config:38 setting RhostsRSAAuthentication no
debug3: /etc/ssh/sshd_config:40 setting HostbasedAuthentication no
debug3: /etc/ssh/sshd_config:45 setting PermitEmptyPasswords no
debug3: /etc/ssh/sshd_config:49 setting ChallengeResponseAuthentication no
debug3: /etc/ssh/sshd_config:52 setting PasswordAuthentication yes
debug3: /etc/ssh/sshd_config:64 setting X11Forwarding yes
debug3: /etc/ssh/sshd_config:65 setting X11DisplayOffset 10
debug3: /etc/ssh/sshd_config:66 setting PrintMotd no
debug3: /etc/ssh/sshd_config:67 setting PrintLastLog yes
debug3: /etc/ssh/sshd_config:68 setting TCPKeepAlive yes
debug3: /etc/ssh/sshd_config:75 setting AcceptEnv LANG LC_*
debug3: /etc/ssh/sshd_config:77 setting Subsystem sftp /usr/lib/openssh/sftp-server
debug3: /etc/ssh/sshd_config:88 setting UsePAM yes
debug1: sshd version OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug3: Incorrect RSA1 identifier
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type RSA
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/ssh/ssh_host_rsa_key" as a RSA1 public key
debug1: private host key: #0 type 1 RSA
debug3: Incorrect RSA1 identifier
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/ssh/ssh_host_dsa_key" as a RSA1 public key
debug1: private host key: #1 type 2 DSA
debug3: Incorrect RSA1 identifier
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type ECDSA
debug3: Incorrect RSA1 identifier
debug3: Could not load "/etc/ssh/ssh_host_ecdsa_key" as a RSA1 public key
debug1: private host key: #2 type 3 ECDSA
debug1: could not open key file '/etc/ssh/ssh_host_ed25519_key': No such file or directory
Could not load host key: /etc/ssh/ssh_host_ed25519_key
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-d'
debug1: rexec_argv[2]='-d'
debug1: rexec_argv[3]='-d'
debug1: rexec_argv[4]='-p'
debug1: rexec_argv[5]='2222'
debug3: oom_adjust_setup
Set /proc/self/oom_score_adj from 0 to -1000
debug2: fd 3 setting O_NONBLOCK
debug1: Bind to port 2222 on 0.0.0.0.
Server listening on 0.0.0.0 port 2222.
debug2: fd 4 setting O_NONBLOCK
debug3: sock_set_v6only: set socket 4 IPV6_V6ONLY
debug1: Bind to port 2222 on ::.
Server listening on :: port 2222.
debug3: fd 5 is not O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 8 config len 763
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from 10.0.0.4 port 37252 on 10.0.0.223 port 2222
debug1: Client protocol version 2.0; client software version Sun_SSH_1.5
debug1: no match: Sun_SSH_1.5
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug2: fd 3 setting O_NONBLOCK
debug2: Network child is on pid 10121
debug3: preauth child monitor started
debug3: privsep user:group 104:65534 [preauth]
debug1: permanently_set_uid: 104/65534 [preauth]
debug1: list_hostkey_types: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug2: kex_parse_kexinit:
curve255...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 [preauth]
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,
aes12...@openssh.com,
aes25...@openssh.com,
chacha20...@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,
rijnda...@lysator.liu.se [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,
aes12...@openssh.com,
aes25...@openssh.com,
chacha20...@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,
rijnda...@lysator.liu.se [preauth]
debug2: kex_parse_kexinit:
hmac-m...@openssh.com,
hmac-s...@openssh.com,
umac-...@openssh.com,
umac-1...@openssh.com,
hmac-sha...@openssh.com,
hmac-sha...@openssh.com,
hmac-ripe...@openssh.com,
hmac-sha...@openssh.com,
hmac-md...@openssh.com,hmac-md5,hmac-sha1,
uma...@openssh.com,
umac...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,
hmac-ri...@openssh.com,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit:
hmac-m...@openssh.com,
hmac-s...@openssh.com,
umac-...@openssh.com,
umac-1...@openssh.com,
hmac-sha...@openssh.com,
hmac-sha...@openssh.com,
hmac-ripe...@openssh.com,
hmac-sha...@openssh.com,
hmac-md...@openssh.com,hmac-md5,hmac-sha1,
uma...@openssh.com,
umac...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,
hmac-ri...@openssh.com,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: [preauth]
debug2: kex_parse_kexinit: [preauth]
debug2: kex_parse_kexinit: first_kex_follows 0 [preauth]
debug2: kex_parse_kexinit: reserved 0 [preauth]
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour128,arcfour256,arcfour,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,3des-cbc [preauth]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour128,arcfour256,arcfour,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,3des-cbc [preauth]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96 [preauth]
debug2: kex_parse_kexinit: zlib,none [preauth]
debug2: kex_parse_kexinit: zlib,none [preauth]
debug2: kex_parse_kexinit: en-US [preauth]
debug2: kex_parse_kexinit: en-US [preauth]
debug2: kex_parse_kexinit: first_kex_follows 0 [preauth]
debug2: kex_parse_kexinit: reserved 0 [preauth]
debug2: mac_setup: setup hmac-md5 [preauth]
debug1: kex: client->server aes128-ctr hmac-md5 none [preauth]
debug2: mac_setup: setup hmac-md5 [preauth]
debug1: kex: server->client aes128-ctr hmac-md5 none [preauth]
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received [preauth]
debug3: mm_request_send entering: type 0 [preauth]
debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI [preauth]
debug3: mm_request_receive_expect entering: type 1 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 0
debug3: mm_answer_moduli: got parameters: 1024 2048 8192
debug3: mm_request_send entering: type 1
debug2: monitor_read: 0 used once, disabling now
debug3: mm_choose_dh: remaining 0 [preauth]
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent [preauth]
debug2: bits set: 1017/2048 [preauth]
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT [preauth]
debug2: bits set: 1026/2048 [preauth]
debug3: mm_key_sign entering [preauth]
debug3: mm_request_send entering: type 6 [preauth]
debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN [preauth]
debug3: mm_request_receive_expect entering: type 7 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 6
debug3: mm_answer_sign
debug3: mm_answer_sign: signature 0x7f506484eda0(271)
debug3: mm_request_send entering: type 7
debug2: monitor_read: 6 used once, disabling now
debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent [preauth]
debug2: kex_derive_keys [preauth]
debug2: set_newkeys: mode 1 [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
debug2: set_newkeys: mode 0 [preauth]
debug1: SSH2_MSG_NEWKEYS received [preauth]
debug1: KEX done [preauth]
debug1: userauth-request for user vagrant service ssh-connection method none [preauth]
debug1: attempt 0 failures 0 [preauth]
debug3: mm_getpwnamallow entering [preauth]
debug3: mm_request_send entering: type 8 [preauth]
debug3: mm_getpwnamallow: waiting for MONITOR_ANS_PWNAM [preauth]
debug3: mm_request_receive_expect entering: type 9 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 8
debug3: mm_answer_pwnamallow
debug3: Trying to reverse map address 10.0.0.4.
debug2: parse_server_config: config reprocess config len 763
debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
debug3: mm_request_send entering: type 9
debug2: monitor_read: 8 used once, disabling now
debug2: input_userauth_request: setting up authctxt for vagrant [preauth]
debug3: mm_start_pam entering [preauth]
debug3: mm_request_send entering: type 100 [preauth]
debug3: mm_inform_authserv entering [preauth]
debug3: mm_request_send entering: type 4 [preauth]
debug2: input_userauth_request: try method none [preauth]
debug3: userauth_finish: failure partial=0 next methods="publickey,password" [preauth]
Connection closed by 10.0.0.4 [preauth]
debug1: do_cleanup [preauth]
debug3: PAM: sshpam_thread_cleanup entering [preauth]
debug1: monitor_read_log: child log fd closed
debug3: mm_request_receive entering
debug3: monitor_read: checking request 100
debug1: PAM: initializing for "vagrant"
debug1: PAM: setting PAM_RHOST to "10.0.0.4"
debug1: PAM: setting PAM_TTY to "ssh"
debug2: monitor_read: 100 used once, disabling now
debug3: mm_request_receive entering
debug3: monitor_read: checking request 4
debug3: mm_answer_authserv: service=ssh-connection, style=, role=
debug2: monitor_read: 4 used once, disabling now
debug3: mm_request_receive entering
debug1: do_cleanup
debug1: PAM: cleanup
debug3: PAM: sshpam_thread_cleanup entering
debug1: Killing privsep child 10121