Right so Mika sorted my wlan and I've cured a sound defect myself. There is no urgency whatsoever in this, but I'll ask out of curiosity.
The last nuisance puzzling me is X11 forwarding inside my simple home lan. Sounds silly perhaps but I'm just learning how to network for myself. I can X11 forward from my secure shell account based in London: Thus
user@laptop$ ssh -fX moss@mythic-beasts.com xclock
gives me an xclock. This tells me that at least my Xserver and ssh on the laptop must be configured right for X11 forwarding. The home lan is simply the laptop a wireless router BTVOYAGER2110 and my trusty old Pentium II PC. The PII is wired into the router so communication between the laptop and the PII is through the router. There is no longer a monitor connected to the PII.
user@laptop$ ssh -fX user@PII xclock
gives "Error: Can't open display:" followed by a blank line. ssh has failed to set the environmental variable $DISPLAY. It is exactly the same if I put a wire directly between PII and the laptop and configure a static network. The laptop is running grml-2008.11 with apt pointed at Lenny but the PII run grml-1.0 pointed at Etch.
user@laptop$ ssh -Xvvv user@PII
gives this output after accepting the password
debug2: x11_get_proto: /usr/bin/X11/xauth list :0.0 2>/dev/null debug1: Requesting X11 forwarding with authentication spoofing. debug2: channel 0: request x11-req confirm 0 debug2: client_session2_setup: id 0 debug2: channel 0: request pty-req confirm 1 debug3: tty_make_modes: ospeed 38400 debug3: tty_make_modes: ispeed 38400 debug1: Sending environment.
There is then a long list of env ignored including the display
user@PII$ echo $DISPLAY Gives a blank output.
user@PII$ export DISPLAY=:10 # This is poor practice as it can obviate # encryption but I tried it anyhow as # I'm only at home. user@PII$ xclock &
and the xclock shows up in htop but it does not display on the laptop. So the basic problem is that ssh is not setting the display though it ought to. I must have a misconfiguration somewhere on the PII. .ssh/config reads thus
Host * # I know this in not secure. ForwardAgent yes ForwardX11 yes AllowTcpForwarding yes
On Tuesday 27 January 2009 17:37:10 Maurice McCarthy wrote: Hi,
I must have a misconfiguration somewhere on the PII.
You just have to enable X11Forwarding in your sshd_config. Just put ,---- | X11Forwarding yes `---- in your /etc/ssh/sshd_config and reload the ssh daemon.
Uli
On 27/01/2009, Ulrich Dangel schula@grml.org wrote:
Just put ,---- | X11Forwarding yes `---- in your /etc/ssh/sshd_config and reload the ssh daemon.
Uli
Thank you. I tried this just now but stil the $DISPLAY is not set on PII.
Moss
On Tuesday 27 January 2009 20:10:00 moss@mythic-beasts.com wrote:
Thank you. I tried this just now but stil the $DISPLAY is not set on PII.
Do you have xauth installed on the server? Its needed for correct X11Forwarding. Can you please connect via ssh -vX and provide the output?
Uli
Uli
I found the following command to merge the ~/.Xauthority files at http://www.math.uwaterloo.ca/%7Econsulta/greatest-hits/xterm.html but it has not cured the problem
moss@laptop$ xauth extract - $DISPLAY | ssh moss@192.168.1.4 xauth merge -
It executed OK. Maybe I'll reinstall ssh on the PII
Regards Moss
On 27/01/2009, Ulrich Dangel schula@grml.org wrote:
On Tuesday 27 January 2009 20:10:00 moss@mythic-beasts.com wrote:
Thank you. I tried this just now but stil the $DISPLAY is not set on PII.
Do you have xauth installed on the server? Its needed for correct X11Forwarding. Can you please connect via ssh -vX and provide the output?
Uli
Grml mailing list - Grml@mur.at http://lists.mur.at/mailman/listinfo/grml join #grml on irc.freenode.org grml-devel-blog: http://grml.supersized.org/
Uli
I pointed apt on th PII to Lenny instead of Etch and did
# aptitude update && aptitude intall openssh-client openssh-server
To which this bug came up
serious bugs of openssh-client (1:4.3p2-9etch3 -> 1:5.1p1-5) <pending> #513071 - Regression: for some hosts etch can connect but lenny can't
Tried upgrading openssh but something has become broken and dpkg is failing and giving me core dumps. So I think I'll do a minimal Lenny install on the PII. This should do me as I am effectively using the PII as a network hard drive plus a little playing. Thanks for your help.
Fixed.
Don't understand why X11 forwarding did not work before but I re-installed grml-1.0 on the PII and everything worked immediately. I can only think that ssh on the PII had been corrupted somehow.
Thanks Uli Moss
Teilnehmer (3)
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Maurice McCarthy -
moss＠mythic-beasts.com
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Ulrich Dangel