Cannot SSH to remote computer using password

Discussion in 'macOS Sierra (10.12)' started by leo.leo.leo, Jun 27, 2017.

  1. leo.leo.leo macrumors newbie

    Joined:
    Jun 27, 2017
    #1
    Hi all,

    Having a problem trying to SSH from Sierra terminal to another computer running Linux (a version of Debian).

    I want to log in using the username and password of an account on the remote computer.

    When I try to connect, I get the message "Permission denied (publickey).".

    I tried various ways to force the terminal to use a username and password but without success, including:

    ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no pi@192.168.0.100 -vvv

    In all cases, it never asks for a password and it eventually gives up with the message: debug1: No more authentication methods to try.

    On the remote computer, I checked auth.log and see only this:
    Connection closed by <mac's ip address> [preauth]

    This is what I see when I run the ssh command using -vvv:

    Code:
    MyMac:ssh mac_user$ ssh remote_user@192.168.0.100 -vvv
    OpenSSH_7.4p1, LibreSSL 2.5.0
    debug1: Reading configuration data /etc/ssh/ssh_config
    debug2: resolving "192.168.0.100" port 22
    debug2: ssh_connect_direct: needpriv 0
    debug1: Connecting to 192.168.0.100 [192.168.0.100] port 22.
    debug1: Connection established.
    debug1: key_load_public: No such file or directory
    debug1: identity file /Users/mac_user/.ssh/id_rsa type -1
    debug1: key_load_public: No such file or directory
    debug1: identity file /Users/mac_user/.ssh/id_rsa-cert type -1
    debug1: key_load_public: No such file or directory
    debug1: identity file /Users/mac_user/.ssh/id_dsa type -1
    debug1: key_load_public: No such file or directory
    debug1: identity file /Users/mac_user/.ssh/id_dsa-cert type -1
    debug1: key_load_public: No such file or directory
    debug1: identity file /Users/mac_user/.ssh/id_ecdsa type -1
    debug1: key_load_public: No such file or directory
    debug1: identity file /Users/mac_user/.ssh/id_ecdsa-cert type -1
    debug1: key_load_public: No such file or directory
    debug1: identity file /Users/mac_user/.ssh/id_ed25519 type -1
    debug1: key_load_public: No such file or directory
    debug1: identity file /Users/mac_user/.ssh/id_ed25519-cert type -1
    debug1: Enabling compatibility mode for protocol 2.0
    debug1: Local version string SSH-2.0-OpenSSH_7.4
    debug1: Remote protocol version 2.0, remote software version OpenSSH_6.7p1 Debian-5+deb8u3
    debug1: match: OpenSSH_6.7p1 Debian-5+deb8u3 pat OpenSSH* compat 0x04000000
    debug2: fd 3 setting O_NONBLOCK
    debug1: Authenticating to 192.168.0.100:22 as 'remote_user'
    debug3: hostkeys_foreach: reading file "/Users/mac_user/.ssh/known_hosts"
    debug3: record_hostkey: found key type ECDSA in file /Users/mac_user/.ssh/known_hosts:1
    debug3: load_hostkeys: loaded 1 keys from 192.168.0.100
    debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
    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: 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-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
    debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
    debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
    debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
    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@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1
    debug2: host key algorithms: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519
    debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com
    debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@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: curve25519-sha256@libssh.org
    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
    debug3: send packet: type 30
    debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
    debug3: receive packet: type 31
    debug1: Server host key: ecdsa-sha2-nistp256 SHA256:Lm1vevxeBbgCO26lUh/2JSyKBhmoapViOgaqcEaae0E
    debug3: hostkeys_foreach: reading file "/Users/mac_user/.ssh/known_hosts"
    debug3: record_hostkey: found key type ECDSA in file /Users/mac_user/.ssh/known_hosts:1
    debug3: load_hostkeys: loaded 1 keys from 192.168.0.100
    debug1: Host '192.168.0.100' is known and matches the ECDSA host key.
    debug1: Found key in /Users/mac_user/.ssh/known_hosts:1
    debug3: send packet: type 21
    debug2: set_newkeys: mode 1
    debug1: rekey after 134217728 blocks
    debug1: SSH2_MSG_NEWKEYS sent
    debug1: expecting SSH2_MSG_NEWKEYS
    debug3: receive packet: type 21
    debug1: SSH2_MSG_NEWKEYS received
    debug2: set_newkeys: mode 0
    debug1: rekey after 134217728 blocks
    debug2: key: /Users/mac_user/.ssh/id_rsa (0x0)
    debug2: key: /Users/mac_user/.ssh/id_dsa (0x0)
    debug2: key: /Users/mac_user/.ssh/id_ecdsa (0x0)
    debug2: key: /Users/mac_user/.ssh/id_ed25519 (0x0)
    debug3: send packet: type 5
    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: Trying private key: /Users/mac_user/.ssh/id_rsa
    debug3: no such identity: /Users/mac_user/.ssh/id_rsa: No such file or directory
    debug1: Trying private key: /Users/mac_user/.ssh/id_dsa
    debug3: no such identity: /Users/mac_user/.ssh/id_dsa: No such file or directory
    debug1: Trying private key: /Users/mac_user/.ssh/id_ecdsa
    debug3: no such identity: /Users/mac_user/.ssh/id_ecdsa: No such file or directory
    debug1: Trying private key: /Users/mac_user/.ssh/id_ed25519
    debug3: no such identity: /Users/mac_user/.ssh/id_ed25519: No such file or directory
    debug2: we did not send a packet, disable method
    debug1: No more authentication methods to try.
    Permission denied (publickey).
     
  2. fischersd macrumors 601

    fischersd

    Joined:
    Oct 23, 2014
    Location:
    Kitchener, Ontario, Canada
    #2
    I'd say the problem is on your Linux box. Is the pi user in the administrators group? (needs to be to allow SSH logins usually).

    Any problems connecting as root?
     
  3. leo.leo.leo thread starter macrumors newbie

    Joined:
    Jun 27, 2017
    #3
    Thanks for the help.

    I edited sshd_config (on the remote machine) to allow the user pi. While I was there, I saw that the option PasswordAuthentication was set to 'no'. I changed this, restarted SSH and I can now log in.
     

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