Tengo un servidor Debian 9. Puedo conectarme a mi Raspberry Pi y a otros servidores sin problemas. Tengo openSUSE instalado como máquina virtual en VirtualBox. Puedo ingresar a esa máquina virtual sin ningún problema. Para configurar esto en VirtualBox, fui a: Configuración > Red > Avanzado > Reenvío de puerto > Nombre: ssh, Protocolo: TCP, IP del host: (en blanco), Puerto del host: (número de puerto alto aleatorio), IP del invitado: (en blanco ), Puerto de invitado: 22. Esto es para el Adaptador 1 y está "Conectado a: NAT". Estas instrucciones se encuentran en algunas publicaciones diferentes del foro. Hice lo mismo para mi máquina virtual CentOS pero con un puerto de host diferente (número de puerto alto aleatorio). Me aseguré de que el servicio sshd se esté ejecutando con sudo systemctl status sshd. Sin embargo, no puedo acceder a la máquina virtual CentOS. Recibo el siguiente error (última línea a continuación):
~$ ssh -p 1820 [email protected] -v
OpenSSH_7.4p1 Debian-10, OpenSSL 1.0.2k 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 127.0.0.1 [127.0.0.1] port 1820.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/brock/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10
ssh_exchange_identification: read: Connection reset by peer
El problema tiene que ver con cómo está configurado CentOS para su red o ssh. La máquina virtual CentOS no tiene problemas para conectarse a Internet. Parece que esta podría ser una prueba fácil para alguien con VirtualBox. ElISO mínima de CentOSes de 680 MB.
Aquí está el /var/log/secureresultado de hoy cuando intenté iniciar sesión mediante ssh tanto con mi usuario como con mi root.
May 31 00:58:03 localhost sshd[1141]: Server listening on 0.0.0.0 port 22.
May 31 00:58:03 localhost sshd[1141]: Server listening on :: port 22.
May 31 00:58:14 localhost login: pam_unix(login:session): session opened for user root by LOGIN(uid=0)
May 31 00:58:14 localhost login: ROOT LOGIN ON tty1
May 31 00:58:22 localhost polkitd[656]: Registered Authentication Agent for unix-process:2529:3738 (system bus name :1.30 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 00:58:23 localhost login: pam_unix(login:session): session closed for user root
May 31 00:58:23 localhost polkitd[656]: Unregistered Authentication Agent for unix-process:2529:3738 (system bus name :1.30, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
May 31 00:58:25 localhost gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0)
May 31 00:58:27 localhost polkitd[656]: Registered Authentication Agent for unix-session:c1 (system bus name :1.55 [gnome-shell --mode=gdm], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 00:58:39 localhost gdm-password]: pam_unix(gdm-password:session): session opened for user jbc by (unknown)(uid=0)
May 31 00:58:40 localhost gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session closed for user gdm
May 31 00:58:40 localhost polkitd[656]: Unregistered Authentication Agent for unix-session:c1 (system bus name :1.55, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
May 31 00:58:40 localhost polkitd[656]: Registered Authentication Agent for unix-session:2 (system bus name :1.69 [/usr/libexec/xfce-polkit], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 00:59:30 localhost sudo: jbc : user NOT in sudoers ; TTY=pts/0 ; PWD=/home/jbc ; USER=root ; COMMAND=/bin/yum remove --purge chromium
May 31 00:59:42 localhost su: pam_unix(su-l:session): session opened for user root by jbc(uid=1000)
May 31 01:15:18 localhost polkitd[656]: Registered Authentication Agent for unix-process:4582:105315 (system bus name :1.86 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 12:58:19 localhost polkitd[659]: Loading rules from directory /etc/polkit-1/rules.d
May 31 12:58:19 localhost polkitd[659]: Loading rules from directory /usr/share/polkit-1/rules.d
May 31 12:58:19 localhost polkitd[659]: Finished loading, compiling and executing 4 rules
May 31 12:58:19 localhost polkitd[659]: Acquired the name org.freedesktop.PolicyKit1 on the system bus
May 31 12:58:29 localhost sshd[1139]: Server listening on 0.0.0.0 port 22.
May 31 12:58:29 localhost sshd[1139]: Server listening on :: port 22.
May 31 12:58:52 localhost login: pam_unix(login:session): session opened for user jbc by LOGIN(uid=0)
May 31 12:58:52 localhost login: LOGIN ON tty1 BY jbc
May 31 13:02:01 localhost polkitd[659]: Registered Authentication Agent for unix-process:2581:22909 (system bus name :1.34 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 13:02:04 localhost polkitd[659]: Operator of unix-process:2581:22909 successfully authenticated as unix-user:root to gain TEMPORARY authorization for action org.freedesktop.systemd1.manage-units for system-bus-name::1.35 [init 5] (owned by unix-user:jbc)
May 31 13:02:05 localhost polkitd[659]: Unregistered Authentication Agent for unix-process:2581:22909 (system bus name :1.34, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
May 31 13:02:05 localhost login: pam_unix(login:session): session closed for user jbc
May 31 13:02:06 localhost gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0)
May 31 13:02:09 localhost polkitd[659]: Registered Authentication Agent for unix-session:c1 (system bus name :1.64 [gnome-shell --mode=gdm], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 13:02:15 localhost gdm-password]: pam_unix(gdm-password:session): session opened for user jbc by (unknown)(uid=0)
May 31 13:02:16 localhost gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session closed for user gdm
May 31 13:02:16 localhost polkitd[659]: Unregistered Authentication Agent for unix-session:c1 (system bus name :1.64, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
May 31 13:02:17 localhost polkitd[659]: Registered Authentication Agent for unix-session:4 (system bus name :1.78 [/usr/libexec/xfce-polkit], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 13:02:33 localhost su: pam_unix(su-l:session): session opened for user root by jbc(uid=1000)
May 31 13:03:18 localhost polkitd[659]: Registered Authentication Agent for unix-process:4348:30623 (system bus name :1.87 [/usr/bin/pkttyagent --notify-fd 5 --fallback], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8)
May 31 13:03:18 localhost polkitd[659]: Unregistered Authentication Agent for unix-process:4348:30623 (system bus name :1.87, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
Además, /var/log/securerelacionado con ssh:
[root@localhost ~]# cat /var/log/secure | grep "May 31" | grep ssh
May 31 00:58:03 localhost sshd[1141]: Server listening on 0.0.0.0 port 22.
May 31 00:58:03 localhost sshd[1141]: Server listening on :: port 22.
May 31 12:58:29 localhost sshd[1139]: Server listening on 0.0.0.0 port 22.
May 31 12:58:29 localhost sshd[1139]: Server listening on :: port 22.
Respuesta1
Usted dijo:
con un puerto de host diferente (número de puerto alto aleatorio).
pero su registro muestra:
Servidor escuchando en 0.0.0.0 puerto 22.
Cuando intentas iniciar sesión en elCentOScuadro, obtienes la respuesta:
AbiertoSSH_7.4p1Debian-10, OpenSSL 1.0.2k 26 de enero de 2017
Esa es tu caja de Ubuntu respondiendo la llamada.
Habría sido aún más obvio si hubiera incluido su archivo /etc/ssh/sshd_config. La configuración 'Puerto' allídebecoincida con el puerto alto que configure para el reenvío.
Respuesta2
Parece que la autenticación de clave está fallando (¿la tienes configurada?) y es posible que falte la línea en /etc/ssh/sshd_config:
PasswordAuthentication yes
Tal vez incluya el archivo /etc/ssh/sshd_config de la máquina virtual CentOS para obtener más información.