SSH nie działa .. Promt hasła nie nadchodzi

2

Od wczoraj nie jestem w stanie SSH na moim serwerze ubuntu.

Nie używam żadnej metody bez klucza lub klucza publicznego. Jego prosty SSH z nazwą użytkownika i hasłem za każdym razem ..

Mogę jednak zrobić sesję VNC uruchomioną na moim serwerze ubuntu .. Ale obawiam się, że jeśli sesja VNC zakończy się, nie będę mogła się zalogować na serwer ..

Moje wyjście ssh-vvv jest jak poniżej .. 

sumanth@sumanth:~$ ssh -vvv user@serverIP
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
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 172.16.2.156 [172.16.2.156] port 22.
debug1: Connection established.
debug1: identity file /home/sumanth/.ssh/id_rsa type -1
debug1: identity file /home/sumanth/.ssh/id_rsa-cert type -1
debug1: identity file /home/sumanth/.ssh/id_dsa type -1
debug1: identity file /home/sumanth/.ssh/id_dsa-cert type -1
debug1: identity file /home/sumanth/.ssh/id_ecdsa type -1
debug1: identity file /home/sumanth/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/sumanth/.ssh/id_ed25519 type -1
debug1: identity file /home/sumanth/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH_5* compat 0x0c000000
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "172.16.2.156" from file "/home/sumanth/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/sumanth/.ssh/known_hosts:5
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: [email protected],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
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: kex_parse_kexinit: 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
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_setup: setup hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: setup hmac-md5
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA ea:4e:15:52:15:dd:6b:09:d4:36:cb:14:2d:c3:1b:7a
debug3: load_hostkeys: loading entries for host "172.16.2.156" from file "/home/sumanth/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/sumanth/.ssh/known_hosts:5
debug3: load_hostkeys: loaded 1 keys
debug1: Host '172.16.2.156' is known and matches the ECDSA host key.
debug1: Found key in /home/sumanth/.ssh/known_hosts:5
debug1: ssh_ecdsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/sumanth/.ssh/id_rsa ((nil)),
debug2: key: /home/sumanth/.ssh/id_dsa ((nil)),
debug2: key: /home/sumanth/.ssh/id_ecdsa ((nil)),
debug2: key: /home/sumanth/.ssh/id_ed25519 ((nil)),
ssh password Sumanth Lingappa
źródło
Czy twój ssh faktycznie wyświetla błąd, czy po prostu kończy działanie? Sprawdź / etc / ssh_config, zobacz, czy to się zmieniło.
Sobrique
Która wersja Ubuntu działa na serwerze? Jest UseDNSzdefiniowany w /etc/ssh/sshd_config? Wszelkie wskazówki w /var/log/auth.log?
kasperd
@Sobrique: Ubuntu 12.04 LTS
Sumanth Lingappa
@Sobrique: Brak błędu SSH. blokuje się przed monitem o hasło. Nawet się nie kończy. Widziałem plik / etc / ssh / etc_config. Nie ma żadnych zmian ..
Sumanth Lingappa
@kasperd: Ubuntu 12.04 LTS Brak UseDNS nie jest zdefiniowany w / etc / ssh / sshd_config Brak wskazówek w /var/log/auth.log
Sumanth Lingappa

Odpowiedzi:

1

Jedną z rzeczy, które mogą spowolnić logowanie ssh, jest to, że serwer próbuje przeprowadzić wyszukiwanie DNS na adresie klienta. Zwykle nie spowoduje to całkowitego zerwania logowania, ale w każdym razie warto go wyłączyć.

Dodaj to do /etc/ssh/sshd_config

UseDNS no

A następnie wpisz service ssh reloadpowłokę.

kasperd
źródło
To działało @kasperd .. wow, wielkie dzięki !!! Bardzo dziękuję za pomoc
Sumanth Lingappa