* X11 forwarding request failed on channel 0
@ 2019-09-12 15:04 Haanraadts, Mark (HBO) via cygwin
2019-09-12 16:12 ` Brian Inglis
0 siblings, 1 reply; 5+ messages in thread
From: Haanraadts, Mark (HBO) via cygwin @ 2019-09-12 15:04 UTC (permalink / raw)
To: cygwin
I have a problem with remote ssh sessions to corporate Red Hat 6 servers and X11 forwarding. Xclock works perfectly fine on my local CYGWIn install. On a remote server I get:
$ xclock
Error: Can't open display:
Here's the debug shell logfile:
debug2: we sent a password packet, wait for reply
debug1: Authentication succeeded (password).
Authenticated to <host>.
debug1: channel 0: new [client-session]
debug2: channel 0: send open
debug1: Requesting mailto:no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: exec
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: x11_get_proto: /usr/bin/xauth list :0.0 2>/dev/null
debug1: Requesting X11 forwarding with authentication spoofing.
debug2: channel 0: request x11-req confirm 1
debug2: fd 3 setting TCP_NODELAY
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug2: channel 0: request shell confirm 1
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel_input_status_confirm: type 100 id 0
X11 forwarding request failed on channel 0
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Last login: Wed Sep 11 17:01:50 2019 from 10.218.16.112
Did a lot of Googling and I already changed this in /etc/ssh/sshd_config
X11Forwarding yes
AddressFamily inet
X11UseLocalhost no
Here's how I'm starting X-Windows
startxwin &
sleep 10
export DISPLAY=:0.0
xhost +
xterm -sb -sl 5000 -geometry 168x17+380+0 -T "XTERM 1" &
xterm -sb -sl 5000 -geometry 168x17+380+315 -T "XTERM 2" &
xterm -sb -sl 5000 -geometry 168x16+380+600 -T "XTERM 3" &
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: X11 forwarding request failed on channel 0
2019-09-12 15:04 X11 forwarding request failed on channel 0 Haanraadts, Mark (HBO) via cygwin
@ 2019-09-12 16:12 ` Brian Inglis
0 siblings, 0 replies; 5+ messages in thread
From: Brian Inglis @ 2019-09-12 16:12 UTC (permalink / raw)
To: cygwin
On 2019-09-12 07:37, Haanraadts, Mark (HBO) via cygwin wrote:
> I have a problem with remote ssh sessions to corporate Red Hat 6 servers and X11 forwarding. Xclock works perfectly fine on my local CYGWIn install. On a remote server I get:
> $ xclock
> Error: Can't open display:
>
> Here's the debug shell logfile:
>
> debug2: we sent a password packet, wait for reply
> debug1: Authentication succeeded (password).
> Authenticated to <host>.
> debug1: channel 0: new [client-session]
> debug2: channel 0: send open
> debug1: Requesting mailto:no-more-sessions@openssh.com
> debug1: Entering interactive session.
> debug1: pledge: exec
> debug2: channel_input_open_confirmation: channel 0: callback start
> debug2: x11_get_proto: /usr/bin/xauth list :0.0 2>/dev/null
> debug1: Requesting X11 forwarding with authentication spoofing.
> debug2: channel 0: request x11-req confirm 1
> debug2: fd 3 setting TCP_NODELAY
> debug2: client_session2_setup: id 0
> debug2: channel 0: request pty-req confirm 1
> debug2: channel 0: request shell confirm 1
> debug2: channel_input_open_confirmation: channel 0: callback done
> debug2: channel 0: open confirm rwindow 0 rmax 32768
> debug2: channel_input_status_confirm: type 100 id 0
> X11 forwarding request failed on channel 0
> debug2: channel_input_status_confirm: type 99 id 0
> debug2: PTY allocation request accepted on channel 0
> debug2: channel 0: rcvd adjust 2097152
> debug2: channel_input_status_confirm: type 99 id 0
> debug2: shell request accepted on channel 0
> Last login: Wed Sep 11 17:01:50 2019 from 10.218.16.112
>
> Did a lot of Googling and I already changed this in /etc/ssh/sshd_config
> X11Forwarding yes
> AddressFamily inet
> X11UseLocalhost no
>
> Here's how I'm starting X-Windows
> startxwin &
> sleep 10
> export DISPLAY=:0.0
> xhost +
> xterm -sb -sl 5000 -geometry 168x17+380+0 -T "XTERM 1" &
> xterm -sb -sl 5000 -geometry 168x17+380+315 -T "XTERM 2" &
> xterm -sb -sl 5000 -geometry 168x16+380+600 -T "XTERM 3" &
The Cygwin/X shortcut starts X window server with:
run --quote /bin/sh -l -c "cd; exec /usr/bin/startxwin"
You should not manually set DISPLAY - that is set by the X server - you should
start clients from ~/.Xclients, or manually from your X desktop applications menu.
DISPLAY=:0 or DISPLAY=:0.0 are only useful on implied localhost; you either have
to use X11 forwarding:
- on the command line ssh -X | -Y, or
- enable that in ~/.ssh/config on a Host connection:
ForwardX11 yes
ForwardX11Trusted yes
- note that untrusted client sessions are terminated after 20 minutes, or as per
policy, and data returned may be zeroed or access attempts result in an error;
if not using ssh forwarding, the DISPLAY value must be prefixed with a host name
resolvable on the remote host to your local host.
--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
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^ permalink raw reply [flat|nested] 5+ messages in thread
* X11 forwarding request failed on channel 0
@ 2013-06-18 16:28 Andrew DeFaria
2013-06-18 23:06 ` Jon TURNEY
0 siblings, 1 reply; 5+ messages in thread
From: Andrew DeFaria @ 2013-06-18 16:28 UTC (permalink / raw)
To: cygwin
Lately I noticed the following error when attempting to ssh from my
Ubuntu (13.04) systems to my Cygwin system with X11 Forwarding turned on:
X11 forwarding request failed on channel 0
Any idea of how I can fix this?
Not sure if this is a Cygwin issue (but it does involve ssh) or a
Cygwin/X issue.
--
Andrew DeFaria <http://defaria.com>
If you knees bent the other way, what would chairs look like?
--
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^ permalink raw reply [flat|nested] 5+ messages in thread
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2019-09-12 15:04 X11 forwarding request failed on channel 0 Haanraadts, Mark (HBO) via cygwin
2019-09-12 16:12 ` Brian Inglis
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2013-06-18 16:28 Andrew DeFaria
2013-06-18 23:06 ` Jon TURNEY
2013-06-19 2:02 ` Andrew DeFaria
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