X11 Forwarding Problem Post: 83369

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Operating Systems Linux Debian X11 Forwarding Problem Post 83369 by deckard on Wednesday 14th of September 2005 09:39:12 AM

09-14-2005

Registered User

Well...

Hmmm... I'm not sure how you can check this with PuTTY, but it sounds like you might be running Cygwin on your Windows box, so... do you have the Cygwin OpenSSH client installed? If so, try this:

ssh -X debian.box.2

Log in as usual, etc... That should give you an ssh connection with X forwarding enabled (That's the -X). Then try to launch an X app and see if it comes through. If it does, try this at a shell prompt

~#

The '~' is the escape character for OpenSSH and the '#' asks the OpenSSH client to display all forwarded connections in use. You should see something like this:

Code:

$ ~#
The following connections are open:
  #0 client-session (t4 r0 i0/0 o0/0 fd 4/5)
  #1 x11 (t4 r2 i0/0 o0/0 fd 7/7)

The important part of this is the #1 line. It indicates that X11 forwarding is currently active. It will only display if your X app launches. If your X app doesn't launch, you'll only see the #0 line.

You could also try running your ssh server with the -ddd option in order to take a look at debugging output. What you should do is:

1. Connect to debian box 2 and stop OpenSSH services
2. Manually run sshd as follows:

sshd -ddd

3. You should see a bunch of stuff scroll past you. Attempt to make your connection with whatever SSH client you want to use with X forwarding enabled. Then attempt to launch an X application. The terminal you started sshd in should give you a lot of information which you can post here.

Once you disconnect, the sshd process will die. When it's in debug mode it only allows one connection and then dies, so this is normal. Once you've got a good debug log, just restart your ssh services as normal.

This is assuming you have root access on debian box 2 BTW...

deckard

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LEARN ABOUT X11R4

ssh-keysign

ssh-keysign(1M)                                                                                                                    ssh-keysign(1M)

NAME

       ssh-keysign - ssh helper program for host-based authentication

SYNOPSIS

       ssh-keysign

       ssh-keysign  is  used  by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication
       with SSH protocol version 2. This signature is of data that includes, among other items, the name of the client host and the  name  of  the
       client user.

       ssh-keysign  is  disabled  by  default and can be enabled only in the global client configuration file /etc/ssh/ssh_config by setting Host-
       basedAuthentication to yes.

       ssh-keysign is not intended to be invoked by the user, but from ssh. See ssh(1) and sshd(1M) for more information about host-based  authen-
       tication.

       /etc/ssh/ssh_config

           Controls whether ssh-keysign is enabled.

       /etc/ssh/ssh_host_dsa_key
       /etc/ssh/ssh_host_rsa_key

           These  files  contain the private parts of the host keys used to generate the digital signature. They should be owned by root, readable
           only by root, and not accessible to others. Because they are readable only by root, ssh-keysign must  be  set-uid  root  if  host-based
           authentication is used.

       ssh-keysign will not sign host-based authentication data under the following conditions:

         o  If the HostbasedAuthentication client configuration parameter is not set to yes in /etc/ssh/ssh_config. This setting cannot be overri-
            den in users' ~/.ssh/ssh_config files.

         o  If the client hostname and username in /etc/ssh/ssh_config do not match the canonical hostname of  the  client  where  ssh-keysign  is
            invoked and the name of the user invoking ssh-keysign.

       In  spite of ssh-keysign's restrictions on the contents of the host-based authentication data, there remains the ability of users to use it
       as an avenue for obtaining the client's private host keys. For this reason host-based authentication is turned off by default.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWsshu                     |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

       ssh(1), sshd(1M), ssh_config(4), attributes(5)

AUTHORS

       Markus Friedl, markus@openbsd.org

HISTORY

       ssh-keysign first appeared in Ox 3.2.

                                                                    9 Jun 2004                                                     ssh-keysign(1M)