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SSH Connection Debug Log Analysis

The SSH client is attempting to connect to a remote server and authenticate the user. It checks the user's configuration and known hosts files, negotiates encryption and authentication methods with the server, but is unable to authenticate using any of the private keys on the local system. The connection fails due to a lack of a valid private key to use for authentication.

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0% found this document useful (0 votes)
124 views4 pages

SSH Connection Debug Log Analysis

The SSH client is attempting to connect to a remote server and authenticate the user. It checks the user's configuration and known hosts files, negotiates encryption and authentication methods with the server, but is unable to authenticate using any of the private keys on the local system. The connection fails due to a lack of a valid private key to use for authentication.

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gojod
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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OpenSSH_9.1p1, OpenSSL 3.0.

7 1 Nov 2022
debug1: Reading configuration data /home/vladyslav/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolve_canonicalize: hostname 38.126.208.219 is address
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' ->
'/home/vladyslav/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' ->
'/home/vladyslav/.ssh/known_hosts2'
debug3: ssh_connect_direct: entering
debug1: Connecting to 38.126.208.219 [38.126.208.219] port 22.
debug3: set_sock_tos: set socket 3 IP_TOS 0x48
debug1: Connection established.
debug1: identity file /home/vladyslav/.ssh/id_rsa type -1
debug1: identity file /home/vladyslav/.ssh/id_rsa-cert type -1
debug1: identity file /home/vladyslav/.ssh/id_ecdsa type -1
debug1: identity file /home/vladyslav/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/vladyslav/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/vladyslav/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/vladyslav/.ssh/id_ed25519 type -1
debug1: identity file /home/vladyslav/.ssh/id_ed25519-cert type -1
debug1: identity file /home/vladyslav/.ssh/id_ed25519_sk type -1
debug1: identity file /home/vladyslav/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/vladyslav/.ssh/id_xmss type -1
debug1: identity file /home/vladyslav/.ssh/id_xmss-cert type -1
debug1: identity file /home/vladyslav/.ssh/id_dsa type -1
debug1: identity file /home/vladyslav/.ssh/id_dsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.9p1 Ubuntu-
3ubuntu0.1
debug1: compat_banner: match: OpenSSH_8.9p1 Ubuntu-3ubuntu0.1 pat OpenSSH* compat
0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 38.126.208.219:22 as 'cience'
debug3: record_hostkey: found key type ED25519 in file
/home/vladyslav/.ssh/known_hosts:16
debug3: load_hostkeys_file: loaded 1 keys from 38.126.208.219
debug1: load_hostkeys: fopen /home/vladyslav/.ssh/known_hosts2: No such file or
directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug3: order_hostkeyalgs: have matching best-preference key type ssh-ed25519-cert-
v01@openssh.com, using HostkeyAlgorithms verbatim
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: sntrup761x25519-sha512@openssh.com,curve25519-
sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-
sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-
sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-
cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-
cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-
cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-
v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-
nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-
512,rsa-sha2-256
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-
ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-
ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-
etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-
64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-
etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-
64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-
nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,sntrup761x25519-
sha512@openssh.com,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-
sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-
ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-
ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-
ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-
etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-
64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-
etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-
64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@openssh.com
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: sntrup761x25519-sha512@openssh.com
debug1: kex: host key algorithm: ssh-ed25519
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
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ssh-ed25519
SHA256:fBHxI+t2EECyIhR/2qxR1zwG70qO+AoGSwLBKT3proQ
debug3: record_hostkey: found key type ED25519 in file
/home/vladyslav/.ssh/known_hosts:16
debug3: load_hostkeys_file: loaded 1 keys from 38.126.208.219
debug1: load_hostkeys: fopen /home/vladyslav/.ssh/known_hosts2: No such file or
directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: Host '38.126.208.219' is known and matches the ED25519 host key.
debug1: Found key in /home/vladyslav/.ssh/known_hosts:16
debug3: send packet: type 21
debug2: ssh_set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: ssh_set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug3: ssh_get_authentication_socket_path: path '/run/user/1000/gnupg/S.gpg-
agent.ssh'
debug2: get_agent_identities: ssh_agent_bind_hostkey: agent refused operation
debug1: get_agent_identities: agent returned 1 keys
debug1: Will attempt key: (none) ED25519
SHA256:07DEdvNymM0Ogc2Bq7iYRRn0oz/FmLKrvhhvyfFCDoA agent
debug1: Will attempt key: /home/vladyslav/.ssh/id_rsa
debug1: Will attempt key: /home/vladyslav/.ssh/id_ecdsa
debug1: Will attempt key: /home/vladyslav/.ssh/id_ecdsa_sk
debug1: Will attempt key: /home/vladyslav/.ssh/id_ed25519
debug1: Will attempt key: /home/vladyslav/.ssh/id_ed25519_sk
debug1: Will attempt key: /home/vladyslav/.ssh/id_xmss
debug1: Will attempt key: /home/vladyslav/.ssh/id_dsa
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,sk-ssh-
ed25519@openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-
nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-
nistp256@openssh.com,webauthn-sk-ecdsa-sha2-nistp256@openssh.com>
debug1: kex_input_ext_info: publickey-hostbound@openssh.com=<0>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: (none) ED25519
SHA256:07DEdvNymM0Ogc2Bq7iYRRn0oz/FmLKrvhhvyfFCDoA agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/vladyslav/.ssh/id_rsa
debug3: no such identity: /home/vladyslav/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/vladyslav/.ssh/id_ecdsa
debug3: no such identity: /home/vladyslav/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/vladyslav/.ssh/id_ecdsa_sk
debug3: no such identity: /home/vladyslav/.ssh/id_ecdsa_sk: No such file or
directory
debug1: Trying private key: /home/vladyslav/.ssh/id_ed25519
debug3: no such identity: /home/vladyslav/.ssh/id_ed25519: No such file or
directory
debug1: Trying private key: /home/vladyslav/.ssh/id_ed25519_sk
debug3: no such identity: /home/vladyslav/.ssh/id_ed25519_sk: No such file or
directory
debug1: Trying private key: /home/vladyslav/.ssh/id_xmss
debug3: no such identity: /home/vladyslav/.ssh/id_xmss: No such file or directory
debug1: Trying private key: /home/vladyslav/.ssh/id_dsa
debug3: no such identity: /home/vladyslav/.ssh/id_dsa: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
cience@38.126.208.219: Permission denied (publickey).

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