Sorry for the delay ...here is the very verbose log:
ssh -vvv -x testuser@testserver
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 testserver [192.168.0.83] port 22.
debug1: Connection established.
debug1: identity file /home/testuser/.ssh/id_rsa type -1
debug1: identity file /home/testuser/.ssh/id_rsa-cert type -1
debug1: identity file /home/testuser/.ssh/id_dsa type -1
debug1: identity file /home/testuser/.ssh/id_dsa-cert type -1
debug1: identity file /home/testuser/.ssh/id_ecdsa type -1
debug1: identity file /home/testuser/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/testuser/.ssh/id_ed25519 type -1
debug1: identity file /home/testuser/.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_6.2
debug1: match: OpenSSH_6.2 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "testserver" from file "/home/testuser/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit:
curve25519-sha256@libssh.org,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:
ecdsa-sha2-nistp256-cert-v01@openssh.com,
ecdsa-sha2-nistp384-cert-v01@openssh.com,
ecdsa-sha2-nistp521-cert-v01@openssh.com,
ssh-ed25519-cert-v01@openssh.com,
ssh-rsa-cert-v01@openssh.com,
ssh-dss-cert-v01@openssh.com,
ssh-rsa-cert-v00@openssh.com,
ssh-dss-cert-v00@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,
aes128-gcm@openssh.com,
aes256-gcm@openssh.com,
chacha20-poly1305@openssh.com,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-gcm@openssh.com,
aes256-gcm@openssh.com,
chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,
rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit:
hmac-md5-etm@openssh.com,
hmac-sha1-etm@openssh.com,
umac-64-etm@openssh.com,
umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,
hmac-sha2-512-etm@openssh.com,
hmac-ripemd160-etm@openssh.com,
hmac-sha1-96-etm@openssh.com,
hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,
umac-64@openssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,
hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit:
hmac-md5-etm@openssh.com,
hmac-sha1-etm@openssh.com,
umac-64-etm@openssh.com,
umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,
hmac-sha2-512-etm@openssh.com,
hmac-ripemd160-etm@openssh.com,
hmac-sha1-96-etm@openssh.com,
hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,
umac-64@openssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,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: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==,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-gcm@openssh.com,
aes256-gcm@openssh.com,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-gcm@openssh.com,
aes256-gcm@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,
rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit:
hmac-md5-etm@openssh.com,
hmac-sha1-etm@openssh.com,
umac-64-etm@openssh.com,
umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,
hmac-sha2-512-etm@openssh.com,
hmac-ripemd160-etm@openssh.com,
hmac-sha1-96-etm@openssh.com,
hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,
umac-64@openssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,
hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit:
hmac-md5-etm@openssh.com,
hmac-sha1-etm@openssh.com,
umac-64-etm@openssh.com,
umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,
hmac-sha2-512-etm@openssh.com,
hmac-ripemd160-etm@openssh.com,
hmac-sha1-96-etm@openssh.com,
hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,
umac-64@openssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,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: setup
hmac-md5-etm@openssh.com
debug1: kex: server->client aes128-ctr
hmac-md5-etm@openssh.com none
debug2: mac_setup: setup
hmac-md5-etm@openssh.com
debug1: kex: client->server aes128-ctr
hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA 0f:9c:0d:e2:ff:b1:43:10:3f:fe:22:48:af:d7:5d:79
debug3: load_hostkeys: loading entries for host "testserver" from file "/home/testuser/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug3: load_hostkeys: loading entries for host "192.168.0.83" from file "/home/testuser/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
The authenticity of host 'testserver (192.168.0.83)' can't be established.
ECDSA key fingerprint is 0f:9c:0d:e2:ff:b1:43:10:3f:fe:22:48:af:d7:5d:79.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'testserver,192.168.0.83' (ECDSA) to the list of known hosts.
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/testuser/.ssh/id_rsa ((nil)),
debug2: key: /home/testuser/.ssh/id_dsa ((nil)),
debug2: key: /home/testuser/.ssh/id_ecdsa ((nil)),
debug2: key: /home/testuser/.ssh/id_ed25519 ((nil)),
debug3: input_userauth_banner
Debian GNU/Linux 7 eda2 ssh-pty
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password,keyboard-interactive
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password,keyboard-interactive
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-keyex
debug3: remaining preferred: gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-keyex
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug2: we did not send a packet, disable method
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure. Minor code may provide more information
No Kerberos credentials available
debug1: Unspecified GSS failure. Minor code may provide more information
No Kerberos credentials available
debug1: Unspecified GSS failure. Minor code may provide more information
debug1: Unspecified GSS failure. Minor code may provide more information
No Kerberos credentials available
debug2: we did not send a packet, disable method
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/testuser/.ssh/id_rsa
debug3: no such identity: /home/testuser/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /home/testuser/.ssh/id_dsa
debug3: no such identity: /home/testuser/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/testuser/.ssh/id_ecdsa
debug3: no such identity: /home/testuser/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/testuser/.ssh/id_ed25519
debug3: no such identity: /home/testuser/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1
Password:
debug3: packet_send2: adding 32 (len 19 padlen 13 extra_pad 64)
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 0
debug3: packet_send2: adding 48 (len 6 padlen 10 extra_pad 64)
debug1: Authentication succeeded (keyboard-interactive).
Authenticated to testserver ([192.168.0.83]:22).
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.
debug2: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: packet_set_tos: set IP_TOS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug1: Sending environment.
debug3: Ignored env XDG_VTNR
debug3: Ignored env MANPATH
debug3: Ignored env SSH_AGENT_PID
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env XDG_GREETER_DATA_DIR
debug3: Ignored env SELINUX_INIT
debug3: Ignored env CLUTTER_IM_MODULE
debug3: Ignored env SESSION
debug3: Ignored env GLADE_PIXMAP_PATH
debug3: Ignored env TERM
debug3: Ignored env VTE_VERSION
debug3: Ignored env XDG_MENU_PREFIX
debug3: Ignored env SHELL
debug3: Ignored env SSH_AGENT_LAUNCHER
debug3: Ignored env DERBY_HOME
debug3: Ignored env WINDOWID
debug3: Ignored env UPSTART_SESSION
debug3: Ignored env GNOME_KEYRING_CONTROL
debug3: Ignored env GTK_MODULES
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug3: Ignored env GLADE_MODULE_PATH
debug3: Ignored env XDG_SESSION_PATH
debug3: Ignored env XDG_SEAT_PATH
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env SESSION_MANAGER
debug3: Ignored env DEFAULTS_PATH
debug3: Ignored env XDG_CONFIG_DIRS
debug3: Ignored env DESKTOP_SESSION
debug3: Ignored env PATH
debug3: Ignored env QT_IM_MODULE
debug3: Ignored env QT_QPA_PLATFORMTHEME
debug3: Ignored env PWD
debug3: Ignored env JOB
debug3: Ignored env XMODIFIERS
debug3: Ignored env JAVA_HOME
debug3: Ignored env GNOME_KEYRING_PID
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: Ignored env GDM_LANG
debug3: Ignored env MANDATORY_PATH
debug3: Ignored env UBUNTU_MENUPROXY
debug3: Ignored env IM_CONFIG_PHASE
debug3: Ignored env GDMSESSION
debug3: Ignored env SESSIONTYPE
debug3: Ignored env SHLVL
debug3: Ignored env HOME
debug3: Ignored env XDG_SEAT
debug3: Ignored env LANGUAGE
debug3: Ignored env UPSTART_INSTANCE
debug3: Ignored env UPSTART_EVENTS
debug3: Ignored env LOGNAME
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env J2SDKDIR
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env QT4_IM_MODULE
debug3: Ignored env LESSOPEN
debug3: Ignored env TEXTDOMAIN
debug3: Ignored env INSTANCE
debug3: Ignored env UPSTART_JOB
debug3: Ignored env XDG_RUNTIME_DIR
debug3: Ignored env DISPLAY
debug3: Ignored env GLADE_CATALOG_PATH
debug3: Ignored env XDG_CURRENT_DESKTOP
debug3: Ignored env GTK_IM_MODULE
debug3: Ignored env J2REDIR
debug3: Ignored env LESSCLOSE
debug3: Ignored env TEXTDOMAINDIR
debug3: Ignored env XAUTHORITY
debug3: Ignored env COLORTERM
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
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
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
You have new mail.
Last login: Wed Nov 26 14:52:16 2014 from cyberhelp.innovasic.com
testuser@testserver:~$ xclock &
[1] 12921
testuser@testserver:~$ Error: Can't open display:
levlaz wrote:Hi!
This is a certainly a strange issue. I have a very similar setup and it works fine for me. When echo $DISPLAY returns nothing, this means that the X11 forwarding is not actually working. In order to troubleshoot this a bit further can you paste the output of the following command (replace user with your username and server with the domain name or IP address of your server):
-vvv is just very verbose logging so hopefully this will give us a hint of what the problem is.
Best,
Lev