Hola, Intento resolver un problema en un servidor remoto. Debian 7 "old-stable" acceso por ssh / nat. Desde hace unos días no es posible conectarse. Del lado del cliente, versión (OpenSSH_6.7p1 Debian-5+deb8u3, OpenSSL 1.0.1t) la cosa termina en un time-out. Se usan llaves ssh-rsa publica/privada. No han habido actualizaciones recientes.
Esta es la salida del cliente : $ ssh -vvv -p 2022 u...@servidor.domain.com OpenSSH_6.7p1 Debian-5+deb8u3, OpenSSL 1.0.1t 3 May 2016 debug1: Reading configuration data /home/user/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to servidor.domain.com [xxx.xxx.xxx.xxx port 2022. debug1: connect to address xxx.xxx.xxx.xxx port 2022: Connection timed out ssh: connect to host servidor.domain.com 2022: Connection timed out Esta es la salida del servidor (OpenSSH_6.0p1 Debian-4+deb7u2) en debug: # /sbin/sshd -p 22 -D -ddd -e debug2: load_server_config: filename /etc/ssh/sshd_config debug2: load_server_config: done config len = 648 debug2: parse_server_config: config /etc/ssh/sshd_config len 648 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:14 setting UsePrivilegeSeparation yes debug3: /etc/ssh/sshd_config:17 setting KeyRegenerationInterval 3600 debug3: /etc/ssh/sshd_config:18 setting ServerKeyBits 768 debug3: /etc/ssh/sshd_config:21 setting SyslogFacility AUTH debug3: /etc/ssh/sshd_config:22 setting LogLevel INFO debug3: /etc/ssh/sshd_config:25 setting LoginGraceTime 120 debug3: /etc/ssh/sshd_config:26 setting PermitRootLogin yes debug3: /etc/ssh/sshd_config:27 setting StrictModes yes debug3: /etc/ssh/sshd_config:29 setting RSAAuthentication yes debug3: /etc/ssh/sshd_config:30 setting PubkeyAuthentication yes debug3: /etc/ssh/sshd_config:34 setting IgnoreRhosts yes debug3: /etc/ssh/sshd_config:36 setting RhostsRSAAuthentication no debug3: /etc/ssh/sshd_config:38 setting HostbasedAuthentication no debug3: /etc/ssh/sshd_config:43 setting PermitEmptyPasswords no debug3: /etc/ssh/sshd_config:47 setting ChallengeResponseAuthentication no debug3: /etc/ssh/sshd_config:62 setting X11Forwarding yes debug3: /etc/ssh/sshd_config:63 setting X11DisplayOffset 10 debug3: /etc/ssh/sshd_config:64 setting PrintMotd no debug3: /etc/ssh/sshd_config:65 setting PrintLastLog yes debug3: /etc/ssh/sshd_config:66 setting TCPKeepAlive yes debug3: /etc/ssh/sshd_config:73 setting AcceptEnv LANG LC_* debug3: /etc/ssh/sshd_config:75 setting Subsystem sftp /usr/lib/openssh/sftp-server debug3: /etc/ssh/sshd_config:86 setting UsePAM yes debug1: sshd version OpenSSH_6.0p1 Debian-4+deb7u2 debug3: Incorrect RSA1 identifier debug1: read PEM private key done: type RSA debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: private host key: #0 type 1 RSA debug3: Incorrect RSA1 identifier debug1: read PEM private key done: type DSA debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024 debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024 debug1: private host key: #1 type 2 DSA debug1: rexec_argv[0]='/usr/sbin/sshd' debug1: rexec_argv[1]='-p' debug1: rexec_argv[2]='22' debug1: rexec_argv[3]='-D' debug1: rexec_argv[4]='-ddd' debug1: rexec_argv[5]='-e' debug3: oom_adjust_setup Set /proc/self/oom_score_adj from 0 to -1000 debug2: fd 3 setting O_NONBLOCK debug1: Bind to port 22 on 0.0.0.0. Server listening on 0.0.0.0 port 22. debug2: fd 4 setting O_NONBLOCK debug3: sock_set_v6only: set socket 4 IPV6_V6ONLY debug1: Bind to port 22 on ::. Server listening on :: port 22. Received signal 15; terminating. El servidor sshd recibe la señal term luego de recibir la petición del cliente. Los logs del sistema no contienen mensajes de error. Cualquier ayuda, comentarios, etc. será apreciada. Gracias. Saludos,