X11 Forwarding

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X11 Forwarding

Postby imorhi » Tue Jan 24, 2012 17:46

I have a server set up with a GUI for X11 forwarding.

I can SSH all good and fine
I have X11 forwarding allowed in my sshd_config on the server
I can do X11 forwarding with a different server on the same client
I have installed xauth on the server

I still cannot get my X11 to forward

When I run "echo $DISPLAY" just a blank line shows up so I tried "export DISPLAY=localhost:10.0" and still not working...
This is very frustrating and I don't know what else to do, please help!
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Re: X11 Forwarding

Postby sabayonino » Tue Jan 24, 2012 19:36

Hi my X-fowarding runs well

my sshd_config is :

Code: Select all
#       $OpenBSD: sshd_config,v 1.84 2011/05/23 03:30:07 djm Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options override the
# default value.

#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

# The default requires explicit activation of protocol 1
#Protocol 2

# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key

# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024

# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#RSAAuthentication yes
#PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
#AuthorizedKeysFile     .ssh/authorized_keys

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication no
#PermitEmptyPasswords no

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes

# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes

AllowAgentForwarding yes
AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
X11UseLocalhost yes
PrintMotd no
PrintLastLog no
#TCPKeepAlive yes
#UseLogin no
#UsePrivilegeSeparation yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS yes
#PidFile /var/run/sshd.pid
#MaxStartups 10
#PermitTunnel no
#ChrootDirectory none

# no default banner path
#Banner none

# here are the new patched ldap related tokens
# entries in your LDAP must have posixAccount & ldapPublicKey objectclass
#UseLPK yes
#LpkLdapConf /etc/ldap.conf
#LpkServers  ldap://10.1.7.1/ ldap://10.1.7.2/
#LpkUserDN   ou=users,dc=phear,dc=org
#LpkGroupDN  ou=groups,dc=phear,dc=org
#LpkBindDN cn=Manager,dc=phear,dc=org
#LpkBindPw secret
#LpkServerGroup mail
#LpkFilter (hostAccess=master.phear.org)
#LpkForceTLS no
#LpkSearchTimelimit 3
#LpkBindTimelimit 3
#LpkPubKeyAttr sshPublicKey

# override default of no subsystems
Subsystem       sftp    /usr/lib64/misc/sftp-server

# the following are HPN related configuration options
# tcp receive buffer polling. disable in non autotuning kernels
#TcpRcvBufPoll yes
 
# allow the use of the none cipher
#NoneEnabled no

# disable hpn performance boosts.
#HPNDisabled no

# buffer size for hpn to non-hpn connections
#HPNBufferSize 2048


# Example of overriding settings on a per-user basis
#Match User anoncvs
#       X11Forwarding no
#       AllowTcpForwarding no
#       ForceCommand cvs server



I had uncomment
AllowAgentForwarding yes
AllowTcpForwarding yes
X11Forwarding yes
X11UseLocalhost yes



Remember to restart sshd daemon.
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sabayonino
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Re: X11 Forwarding

Postby BHReach » Fri Jan 27, 2012 19:33

Modifications to my ssh sshd_config on server is slightly different but still works:

X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes
PermitTunnel yes

X forwarding from client:
Code: Select all
ssh -X [email protected]

with compression:
Code: Select all
ssh -C -X [email protected]
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