ssh -Y and ssh -X not working

I have a network consisting of a desktop and laptop linked by wireless.
I communicate between them with ssh. With the Y or X switches I can run
X applications on the laptop from the desktop but not the other way
round. If I try to run X applications on the desktop when on the laptop
nothing happens at all - no error message.

I have exactly the same entries for X in /etc/ssh/sshd_config on both and
also for /etc/X11/Xsession.options.

==========================
X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
KeepAlive yes
========================


# /etc/X11/Xsession.options
#
# configuration options for /etc/X11/Xsession
# See Xsession.options(5) for an explanation of the available options.
allow-failsafe
allow-user-resources
allow-user-xsession
use-ssh-agent
use-session-dbus


Any suggestions for what else to check?

Anthony


--
Anthony Campbell - (E-Mail Removed)
Microsoft-free zone - Using Linux Gnu-Debian
http://www.acampbell.org.uk (blog, book reviews,
on-line books and sceptical articles)

Anthony Campbell wrote:
> I have a network consisting of a desktop and laptop linked by wireless.
> I communicate between them with ssh. With the Y or X switches I can run
> X applications on the laptop from the desktop but not the other way
> round. If I try to run X applications on the desktop when on the laptop
> nothing happens at all - no error message.
>
> I have exactly the same entries for X in /etc/ssh/sshd_config on both and
> also for /etc/X11/Xsession.options.
>
> ==========================
> X11Forwarding yes
> X11DisplayOffset 10
> PrintMotd no
> PrintLastLog yes
> KeepAlive yes
> ========================
>
>
> # /etc/X11/Xsession.options
> #
> # configuration options for /etc/X11/Xsession
> # See Xsession.options(5) for an explanation of the available options.
> allow-failsafe
> allow-user-resources
> allow-user-xsession
> use-ssh-agent
> use-session-dbus
>
>
> Any suggestions for what else to check?
>
> Anthony
>
>

Anthony,

You might see what "DISPLAY" is set to. I've seen cases where it is set
to 0:0 or :0. I think the default for ssh is 10:0.

Also, I'd start with simple apps like xclock or xman. Gnome and KDE
apps can fail for a variety of reasons even if X works properly.


Scott R. Haven
Sr. Systems Engineer
Paisley Systems Inc.
managed services, consulting, and support
www.paisleysystems.com

On 2006-01-05, Scott R. Haven <(E-Mail Removed)> wrote:
> Anthony Campbell wrote:
>> I have a network consisting of a desktop and laptop linked by wireless.
>> I communicate between them with ssh. With the Y or X switches I can run
>> X applications on the laptop from the desktop but not the other way
>> round. If I try to run X applications on the desktop when on the laptop
>> nothing happens at all - no error message.
>>
> You might see what "DISPLAY" is set to. I've seen cases where it is set
> to 0:0 or :0. I think the default for ssh is 10:0.
>
> Also, I'd start with simple apps like xclock or xman. Gnome and KDE
> apps can fail for a variety of reasons even if X works properly.
>
>
> Scott R. Haven
> Sr. Systems Engineer
> Paisley Systems Inc.
> managed services, consulting, and support
> www.paisleysystems.com
>

That was it! Thanks, brilliant. DISPLAY wasn't set at all on the laptop
but was 0:0 on the desktop. I'm actually not sure what it's supposed to
do but I've unset it on both and now it's working fine in both
directions.

Anthony

--
Anthony Campbell - (E-Mail Removed)
Microsoft-free zone - Using Linux Gnu-Debian
http://www.acampbell.org.uk (blog, book reviews,
on-line books and sceptical articles)

Anthony Campbell wrote:
> On 2006-01-05, Scott R. Haven <(E-Mail Removed)> wrote:
>
>>Anthony Campbell wrote:
>>
>>>I have a network consisting of a desktop and laptop linked by wireless.
>>>I communicate between them with ssh. With the Y or X switches I can run
>>>X applications on the laptop from the desktop but not the other way
>>>round. If I try to run X applications on the desktop when on the laptop
>>>nothing happens at all - no error message.
>>>
>>
>>You might see what "DISPLAY" is set to. I've seen cases where it is set
>>to 0:0 or :0. I think the default for ssh is 10:0.
>>
>>Also, I'd start with simple apps like xclock or xman. Gnome and KDE
>>apps can fail for a variety of reasons even if X works properly.
>>
>>
>>Scott R. Haven
>>Sr. Systems Engineer
>>Paisley Systems Inc.
>>managed services, consulting, and support
>>www.paisleysystems.com
>>
>
>
> That was it! Thanks, brilliant. DISPLAY wasn't set at all on the laptop
> but was 0:0 on the desktop. I'm actually not sure what it's supposed to
> do but I've unset it on both and now it's working fine in both
> directions.
>
> Anthony
>

Anthony,

You're welcome. I'm glad to know I'm not the only one still using X
over a network.

Scott R. Haven
Sr. Systems Engineer
Paisley Systems Inc.
managed services, consulting, and support
www.paisleysystems.com