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Old 10-27-2006, 12:50 PM   #1
Registered: Jan 2006
Distribution: Slackware
Posts: 41

Rep: Reputation: 16
X11 forwarding with ssh

I want to enable X11 forwarding so that I can remotely login my slack box and run x applications from a windows machine.

I use putty with the following settings in Connection > SSH > Tunnels:
Enable X11 forwading selected
X display location empty
Remote X11 auth. protocol MIT -Magic-Cookie-1

My /etc/ssh/ssh_config file:
#       $OpenBSD: ssh_config,v 1.22 2006/05/29 12:56:33 dtucker Exp $

# This is the ssh client system-wide configuration file.  See
# ssh_config(5) for more information.  This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.

# Configuration data is parsed as follows:
#  1. command line options
#  2. user-specific file
#  3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.

# Site-wide defaults for some commonly used options.  For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.

Host *
#   ForwardAgent no
ForwardX11 yes
Compression yes
#   RhostsRSAAuthentication no
#   RSAAuthentication yes
#   PasswordAuthentication yes
#   HostbasedAuthentication no
#   GSSAPIAuthentication no
#   GSSAPIDelegateCredentials no
#   BatchMode no
#   CheckHostIP yes
#   AddressFamily any
#   ConnectTimeout 0
#   StrictHostKeyChecking ask
#   IdentityFile ~/.ssh/identity
#   IdentityFile ~/.ssh/id_rsa
#   IdentityFile ~/.ssh/id_dsa
#   Port 22
Protocol 2
#   Cipher 3des
#   Ciphers aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc
#   EscapeChar ~
#   Tunnel no
#   TunnelDevice any:any
#   PermitLocalCommand no
If i look with echo $DISPLAY I get a black line.
(expected response localhost:10.0)
Also looking with netstat -an I don't see any process listening at port 6000.

I already added my ip to xhost with xhost +, and also the localhost with xhost +localhost (not sure if that is needed), and enabled the access list with xhost -.
Old 10-27-2006, 01:09 PM   #2
Senior Member
Registered: Oct 2004
Location: Luxemburg
Distribution: Slackware, OS X
Posts: 1,507

Rep: Reputation: 46
On your Slack box, you need to adapt /etc/ssh/sshd_config, not ssh_config (there's an extra 'd'). The one you changed is for the client, not the server.
I can't help you for the Windows part but if it's a port of OpenSSH, you normally need to give an -X parameter on the client side.
Old 10-27-2006, 01:49 PM   #3
Registered: Jan 2006
Distribution: Slackware
Posts: 41

Original Poster
Rep: Reputation: 16
Thanks Uselpa for opening my eyes.
It is working now. Great.
And that for the second time.

Again thanks a lot


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