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bollob

X11 forwarding ne marche plus

Bonjour à tous,

j'utilise depuis un moment le X11 forwarding sur ma lucid, sans problèmes jusqu'à aujourd'hui :

lorsque je m'y connecte en ssh avec l'option -X, et ce depuis n'importe quelle machine, et que je lance une application graphique j'ai le message suivant :

Error: No display specified

Quelques pistes :

- j'ai l'impression qu'il y a eu une mise à jour de sshd ces jours-ci

- lorsque je suis connecté la variable d'environnement DISPLAY n'existe pas, si je la crée sur le moment avec

export DISPLAY=localhost:10.0

ça ne marche pas, j'obtiens :

Error: can't open display

- lorsque je mets dans sshd_config :

X11UseLocalhost no

là ça marche mais cela ne me satisfait pas vraiment car d'une part, j'ai lu que ça diminue la sécurité, et d'autre part j'aimerais bien comprendre ce qu'il se passe et ce qui a changé.

Quelqu'un a-t-il les mêmes problèmes, voire une idée, une piste et qui sait... une solution ?

Merci d'avance et bonne nuit

Olivier

Dernière modification par bollob (Le 23/09/2010, à 12:31)

chopinhauer

Re : X11 forwarding ne marche plus

J'imagine que l'option X11Forwarding est bien là. En tout cas tu peux lancer 'ssh' avec l'option '-v' et voir la raison pour laquelle le forwarding ne marche pas (c'est vers la fin de la connexion).

---

Pensez à donner un bon titre à vos sujets : cela permettra d'aider d'autres utilisateurs dans votre même situation. Ce n'est pas qu'en donnant des solutions qu'on aide, mais aussi en posant des bonnes questions et… facilement trouvables.

bollob

Re : X11 forwarding ne marche plus

Hello,

Merci pour la réponse

Effectivement je n'y avais pas pensé, voilà qui est fait mais je crois bien que cela n'en dit pas plus sur ce problème. J'ai même comparé avec un autre qui fonctionne et peut-être que quelque chose m'a échappé, mais j'ai l'impression qu'il n'y a pas de différences.

à tout hasard je joins la sortie de la commande, au cas où quelqu'un verrait quelque chose :

molive@ubuntu05:~$ ssh -X 192.168.123.6 -vvv
OpenSSH_5.3p1 Debian-3ubuntu4, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 192.168.123.6 [192.168.123.6] port 22.
debug1: Connection established.
debug1: identity file /home/molive/.ssh/identity type -1
debug1: identity file /home/molive/.ssh/id_rsa type -1
debug1: identity file /home/molive/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3p1 Debian-3ubuntu4
debug1: match: OpenSSH_5.3p1 Debian-3ubuntu4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu4
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug3: Wrote 792 bytes for a total of 831
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: 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
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,rijndael-cbc@lysator.liu.se
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,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,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: 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
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,rijndael-cbc@lysator.liu.se
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,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
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: found hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug3: Wrote 24 bytes for a total of 855
debug2: dh_gen_key: priv key bits set: 126/256
debug2: bits set: 495/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: Wrote 144 bytes for a total of 999
debug3: check_host_in_hostfile: filename /home/molive/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug1: Host '192.168.123.6' is known and matches the RSA host key.
debug1: Found key in /home/molive/.ssh/known_hosts:1
debug2: bits set: 504/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: Wrote 16 bytes for a total of 1015
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug3: Wrote 48 bytes for a total of 1063
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/molive/.ssh/identity ((nil))
debug2: key: /home/molive/.ssh/id_rsa ((nil))
debug2: key: /home/molive/.ssh/id_dsa ((nil))
debug3: Wrote 64 bytes for a total of 1127
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-keyex,gssapi-with-mic,gssapi,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: /home/molive/.ssh/identity
debug3: no such identity: /home/molive/.ssh/identity
debug1: Trying private key: /home/molive/.ssh/id_rsa
debug3: no such identity: /home/molive/.ssh/id_rsa
debug1: Trying private key: /home/molive/.ssh/id_dsa
debug3: no such identity: /home/molive/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
molive@192.168.123.6's password:
debug3: packet_send2: adding 64 (len 58 padlen 6 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug3: Wrote 144 bytes for a total of 1271
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug3: Wrote 128 bytes for a total of 1399
debug2: callback start
debug2: x11_get_proto: /usr/bin/xauth  list :0.0 2>/dev/null
debug1: Requesting X11 forwarding with authentication spoofing.
debug2: channel 0: request x11-req confirm 0
debug3: Wrote 112 bytes for a total of 1511
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug1: Sending environment.
debug3: Ignored env ORBIT_SOCKETDIR
debug3: Ignored env SSH_AGENT_PID
debug3: Ignored env TERM
debug3: Ignored env SHELL
debug3: Ignored env XDG_SESSION_COOKIE
debug3: Ignored env WINDOWID
debug3: Ignored env GNOME_KEYRING_CONTROL
debug3: Ignored env GTK_MODULES
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env DEFAULTS_PATH
debug3: Ignored env SESSION_MANAGER
debug3: Ignored env USERNAME
debug3: Ignored env XDG_CONFIG_DIRS
debug3: Ignored env DESKTOP_SESSION
debug3: Ignored env PATH
debug3: Ignored env PWD
debug3: Ignored env GDM_KEYBOARD_LAYOUT
debug1: Sending env LANG = fr_FR.utf8
debug2: channel 0: request env confirm 0
debug3: Ignored env GNOME_KEYRING_PID
debug3: Ignored env MANDATORY_PATH
debug3: Ignored env GDM_LANG
debug3: Ignored env GDMSESSION
debug3: Ignored env SPEECHD_PORT
debug3: Ignored env SHLVL
debug3: Ignored env HOME
debug3: Ignored env GNOME_DESKTOP_SESSION_ID
debug3: Ignored env LOGNAME
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env LESSOPEN
debug3: Ignored env DISPLAY
debug3: Ignored env LESSCLOSE
debug3: Ignored env XAUTHORITY
debug3: Ignored env COLORTERM
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: Wrote 448 bytes for a total of 1959
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Linux solu-06.solutique.local 2.6.32-24-generic #43-Ubuntu SMP Thu Sep 16 14:58:24 UTC 2010 x86_64 GNU/Linux
Ubuntu 10.04.1 LTS

Welcome to Ubuntu!
* Documentation:  https://help.ubuntu.com/

7 paquets peuvent être mis à jour.
0 mise à jour de sécurité.

Last login: Mon Sep 27 14:14:27 2010 from 192.168.123.195
molive@solu-06:~$ debug3: Wrote 48 bytes for a total of 2007
gdebug3: Wrote 48 bytes for a total of 2055
edebug3: Wrote 48 bytes for a total of 2103
ddebug3: Wrote 48 bytes for a total of 2151
idebug3: Wrote 48 bytes for a total of 2199
tdebug3: Wrote 48 bytes for a total of 2247

(gedit:21883): Gtk-WARNING **: cannot open display:
molive@solu-06:~$ debug3: Wrote 48 bytes for a total of 2295
edebug3: Wrote 48 bytes for a total of 2343
xdebug3: Wrote 48 bytes for a total of 2391
idebug3: Wrote 48 bytes for a total of 2439
tdebug3: Wrote 48 bytes for a total of 2487

logout
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow@openssh.com reply 0
debug2: channel 0: rcvd eow
debug2: channel 0: close_read
debug2: channel 0: input open -> closed
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
debug2: channel 0: rcvd close
debug3: channel 0: will not send data after close
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 client-session (t4 r0 i3/0 o3/0 fd -1/-1 cfd -1)

debug3: channel 0: close_fds r -1 w -1 e 6 c -1
debug3: Wrote 32 bytes for a total of 2519
debug3: Wrote 64 bytes for a total of 2583
Connection to 192.168.123.6 closed.
Transferred: sent 2192, received 2920 bytes, in 10.6 seconds
Bytes per second: sent 206.1, received 274.6
debug1: Exit status 1
molive@ubuntu05:~$

Olivier