F27: ssh X forwarding not working?

[Richard Shaw]

I just installed F27 on my wife's new laptop last night (HP Pavilion 8th
gen Core i5 w/ Intel video) and the audio is not working.

I was going to check/tweak the settings via remote X from my work computer
which I've done several times in F26, however when I try to run an app it
opens on her screen and not in my Xming session on my screen.

I usually use "ssh -XC <user>@<host>"

Anyone know of any changes in F27 that would cause this?

Thanks,
Richard

[Tom Horsley]

On Wed, 15 Nov 2017 10:49:55 -0600
Richard Shaw wrote:
> Anyone know of any changes in F27 that would cause this?

I seem to recall reading that X forwarding doesn't work
with wayland. Could that be relevant here?

[Richard Shaw]

On Wed, Nov 15, 2017 at 11:34 AM, Tom Horsley  wrote:
> On Wed, 15 Nov 2017 10:49:55 -0600
> Richard Shaw wrote:
> > Anyone know of any changes in F27 that would cause this?
>
> I seem to recall reading that X forwarding doesn't work
> with wayland. Could that be relevant here?

Not sure... I did try forwarding from my home desktop to my work laptop and
it was broken, can't find the display so that looks like my problem. I'm
not sure what changed. I'm using Xming which hasn't had a new release since
2007 and PuTTY which is usually pretty reliable and looking at the log
there everything looked fine.

On Wed, Nov 15, 2017 at 11:36 AM, Rick Stevens  wrote:
> When you log into your wife's computer, do a simple "echo $DISPLAY". You
> should get something like "localhost:10.0" or something back. If you get
> nothing, then you should check /etc/ssh/sshd_config (or the files in
> /etc/ssh/ssh_config.d) on your wife's computer and verify that you have
> "X11Forwarding yes" set. If not (it's disabled by default), set it and
> restart sshd on your wife's computer.

Going to try that for my desktop now at this point. I was accidentally
changing the settings in ssh_config instead of sshd_config but once I took
I peak it seems that X11Forwarding is defaulted yes on a fresh F27 install.

Thanks,
Richard

[Rick Stevens]

On 11/15/2017 12:16 PM, Richard Shaw wrote:
> On Wed, Nov 15, 2017 at 11:34 AM, Tom Horsley <[e-mail]
> > wrote:
> On Wed, 15 Nov 2017 10:49:55 -0600
> Richard Shaw wrote:
>
> > Anyone know of any changes in F27 that would cause this?
>
> I seem to recall reading that X forwarding doesn't work
> with wayland. Could that be relevant here?
>
>
> Not sure... I did try forwarding from my home desktop to my work laptop
> and it was broken, can't find the display so that looks like my problem.
> I'm not sure what changed. I'm using Xming which hasn't had a new
> release since 2007 and PuTTY which is usually pretty reliable and
> looking at the log there everything looked fine.
>
> On Wed, Nov 15, 2017 at 11:36 AM, Rick Stevens <[e-mail]
> > wrote:
> When you log into your wife's computer, do a simple "echo $DISPLAY". You
> should get something like "localhost:10.0" or something back. If you get
> nothing, then you should check /etc/ssh/sshd_config (or the files in
> /etc/ssh/ssh_config.d) on your wife's computer and verify that you have
> "X11Forwarding yes" set. If not (it's disabled by default), set it and
> restart sshd on your wife's computer.
>
>
> Going to try that for my desktop now at this point. I was accidentally
> changing the settings in ssh_config instead of sshd_config but once I
> took I peak it seems that X11Forwarding is defaulted yes on a fresh F27
> install.

Yes, I just installed F27 on a VM and see that X11Forwarding is enabled
in /etc/ssh/sshd_config and ForwardX11Trusted is enabled in
/etc/ssh/ssh_config.d/05-redhat.conf as well, so I guess that isn't it.

As I mentioned before, do "echo $DISPLAY" after logging in and verify
the variable is set (something like "localhost:10.0") to see if it's
set. Another poster said that perhaps X11 forwarding doesn't work under
Wayland. I don't use Wayland myself so I can't verify it. Accessing
my VM from my desktop (prophead) does work:

[rick@prophead ~]$ ssh rick@192.168.122.107
    rick@192.168.122.107's password:
    Last login: Wed Nov 15 13:08:37 2017
    [rick@fedora27-virt ~]$ echo $DISPLAY

[rick@fedora27-virt ~]$ exit
    logout
    Connection to 192.168.122.107 closed.
    [rick@prophead ~]$ ssh -X rick@192.168.122.107
    rick@192.168.122.107's password:
    Last login: Wed Nov 15 13:16:26 2017 from 192.168.122.1
    /usr/bin/xauth:  file /home/rick/.Xauthority does not exist
    [rick@fedora27-virt ~]$ echo $DISPLAY
    localhost:10.0

At that point, I could run "galculator" and the display showed up
locally on prophead. Note the F27 VM is NOT running Wayland:

[rick@fedora27-virt ~]$ loginctl
       SESSION        UID USER             SEAT             TTY
             2       1000 rick             seat0
             6       1000 rick

2 sessions listed.
    [rick@fedora27-virt ~]$ loginctl show-session 2
    ...
    Type=x11 <<<<<<<---------- Using X11, not Wayland
    ...

I'm sure others will have more advice and are probably far smarter than
I.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital    [e-mail] -
- AIM/Skype: therps2        ICQ: 226437340           Yahoo: origrps2 -
-                                                                    -
- Political Correctness: The insane doctrine that postulates that it -
-     is entirely possible to pick up a turd by the clean end.       -
----------------------------------------------------------------------

[Ulf Volmer]

On 15.11.2017 18:34, Tom Horsley wrote:
> I seem to recall reading that X forwarding doesn't work
> with wayland. Could that be relevant here?

I'm using wayland since fc26 (and still on fc27) and have no issues
using 'ssh -X'. AFAIK there is a compatibility layer called xwayland to
keep X11 applications running.

best regards
Ulf

[Rick Stevens]

On 11/15/2017 08:49 AM, Richard Shaw wrote:
> I just installed F27 on my wife's new laptop last night (HP Pavilion 8th
> gen Core i5 w/ Intel video) and the audio is not working.
>
> I was going to check/tweak the settings via remote X from my work
> computer which I've done several times in F26, however when I try to run
> an app it opens on her screen and not in my Xming session on my screen.
>
> I usually use "ssh -XC <user>@<host>"
>
> Anyone know of any changes in F27 that would cause this?

When you log into your wife's computer, do a simple "echo $DISPLAY". You
should get something like "localhost:10.0" or something back. If you get
nothing, then you should check /etc/ssh/sshd_config (or the files in
/etc/ssh/ssh_config.d) on your wife's computer and verify that you have
"X11Forwarding yes" set. If not (it's disabled by default), set it and
restart sshd on your wife's computer.

There's also "ForwardX11Trusted" for use with "ssh -Y" and I believe
that's enabled by default on F27 (haven't installed F27 yet).
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital    [e-mail] -
- AIM/Skype: therps2        ICQ: 226437340           Yahoo: origrps2 -
-                                                                    -
-    Reality: A crutch for those who can't handle science fiction    -
----------------------------------------------------------------------