Why does ssh X forwarding timeout after a while? Unicorn Meta Zoo #1: Why another podcast? ...
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Why does ssh X forwarding timeout after a while?
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So I have a mac at work which I like to ssh into my linux box with something like this:
$ ssh -Xt user@mylinux
I can login and start any X11 apps on my linux box no problem. But after 15 minutes or so, I come back to a session (ssh is still running and connected) and I get:
$ xterm
xterm Xt error: Can't open display: localhost:12.0
I've tried using -o "TCPKeepAlive yes" or -o "ServerAliveInterval 30", but still get the same behavior.
Is there something in ssh or on the Mac or my linux sshd conf that kills X-forwarding after a period of inactivity?
ssh x11-forwarding
edited May 23 '16 at 13:32
Nifle
28.3k2395130
asked Mar 30 '12 at 14:12
Larry KyralaLarry Kyrala
233138
migrated from stackoverflow.com Apr 1 '12 at 7:56
This question came from our site for professional and enthusiast programmers.
add a comment |
So I have a mac at work which I like to ssh into my linux box with something like this:
$ ssh -Xt user@mylinux
I can login and start any X11 apps on my linux box no problem. But after 15 minutes or so, I come back to a session (ssh is still running and connected) and I get:
$ xterm
xterm Xt error: Can't open display: localhost:12.0
I've tried using -o "TCPKeepAlive yes" or -o "ServerAliveInterval 30", but still get the same behavior.
Is there something in ssh or on the Mac or my linux sshd conf that kills X-forwarding after a period of inactivity?
ssh x11-forwarding
edited May 23 '16 at 13:32
Nifle
28.3k2395130
asked Mar 30 '12 at 14:12
Larry KyralaLarry Kyrala
233138
migrated from stackoverflow.com Apr 1 '12 at 7:56
This question came from our site for professional and enthusiast programmers.
Is the X server still running? Do existing X apps get killed?
– Ignacio Vazquez-Abrams
Apr 1 '12 at 8:01
add a comment |
So I have a mac at work which I like to ssh into my linux box with something like this:
$ ssh -Xt user@mylinux
I can login and start any X11 apps on my linux box no problem. But after 15 minutes or so, I come back to a session (ssh is still running and connected) and I get:
$ xterm
xterm Xt error: Can't open display: localhost:12.0
I've tried using -o "TCPKeepAlive yes" or -o "ServerAliveInterval 30", but still get the same behavior.
Is there something in ssh or on the Mac or my linux sshd conf that kills X-forwarding after a period of inactivity?
ssh x11-forwarding
edited May 23 '16 at 13:32
Nifle
28.3k2395130
asked Mar 30 '12 at 14:12
Larry KyralaLarry Kyrala
233138
So I have a mac at work which I like to ssh into my linux box with something like this:
$ ssh -Xt user@mylinux
I can login and start any X11 apps on my linux box no problem. But after 15 minutes or so, I come back to a session (ssh is still running and connected) and I get:
$ xterm
xterm Xt error: Can't open display: localhost:12.0
I've tried using -o "TCPKeepAlive yes" or -o "ServerAliveInterval 30", but still get the same behavior.
Is there something in ssh or on the Mac or my linux sshd conf that kills X-forwarding after a period of inactivity?
ssh x11-forwarding
ssh x11-forwarding
edited May 23 '16 at 13:32
Nifle
28.3k2395130
asked Mar 30 '12 at 14:12
Larry KyralaLarry Kyrala
233138
edited May 23 '16 at 13:32
Nifle
28.3k2395130
asked Mar 30 '12 at 14:12
Larry KyralaLarry Kyrala
233138
edited May 23 '16 at 13:32
Nifle
28.3k2395130
edited May 23 '16 at 13:32
Nifle
28.3k2395130
edited May 23 '16 at 13:32
Nifle
28.3k2395130
28.3k2395130
asked Mar 30 '12 at 14:12
Larry KyralaLarry Kyrala
233138
asked Mar 30 '12 at 14:12
Larry KyralaLarry Kyrala
233138
asked Mar 30 '12 at 14:12
Larry KyralaLarry Kyrala
233138
233138
migrated from stackoverflow.com Apr 1 '12 at 7:56
This question came from our site for professional and enthusiast programmers.
migrated from stackoverflow.com Apr 1 '12 at 7:56
This question came from our site for professional and enthusiast programmers.
Is the X server still running? Do existing X apps get killed?
– Ignacio Vazquez-Abrams
Apr 1 '12 at 8:01
add a comment |
Is the X server still running? Do existing X apps get killed?
– Ignacio Vazquez-Abrams
Apr 1 '12 at 8:01
Is the X server still running? Do existing X apps get killed?
– Ignacio Vazquez-Abrams
Apr 1 '12 at 8:01
Is the X server still running? Do existing X apps get killed?
– Ignacio Vazquez-Abrams
Apr 1 '12 at 8:01
add a comment |
3 Answers
3
active
oldest
votes
Using -X, X11 forwarding is enabled in "Untrusted" mode, making use of various X11 security extensions, including a time-limited Xauth cookie.
Use -Y to enable "Trusted" mode for X11, which will enable complete access to your X11 server.
answered Apr 1 '12 at 9:16
grawitygrawity
245k37516576
add a comment |
The default ForwardX11Timeout is 20 minutes for ssh -X, but you can set it to something large (e.g. 7d for 7 days) in .ssh/config
"Trusted" X11 forwarding via ssh -Y actually enables potentially nasty things like keystroke monitoring and screen grabs.
answered Nov 18 '12 at 3:08
BobBob
26133
3
man ssh_configfor this option documentation :)
– drAlberT
May 27 '13 at 16:17
add a comment |
(would comment on Bob's 2012-11-18 answer, but it won't let me yet)
See also https://unix.stackexchange.com/questions/107547/disable-forwardx11timeout-without-forwardx11trusted-in-openssh-client in which we find that you cannot (in 2019) disable this timeout, but you can extend it.
The maximum timeout is uint_max of milliseconds minus some slack, just over 24 days. OpenSSH_7.4p1 will accept ssh -o ForwardX11Timeout=2147423s -X ... which is the best answer I can make now. ForwardX11Timeout above this may crash the XServer in some version combinations.
On MacOS with XQuartz, I have seen Warning: untrusted X11 forwarding setup failed: xauth key data not generated and upon digging further, /opt/X11/bin/xauth: timeout in locking authority file /var/folders/..../xauthfile .
answered 16 hours ago
mcastmcast
1
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mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
Using -X, X11 forwarding is enabled in "Untrusted" mode, making use of various X11 security extensions, including a time-limited Xauth cookie.
Use -Y to enable "Trusted" mode for X11, which will enable complete access to your X11 server.
answered Apr 1 '12 at 9:16
grawitygrawity
245k37516576
add a comment |
Using -X, X11 forwarding is enabled in "Untrusted" mode, making use of various X11 security extensions, including a time-limited Xauth cookie.
Use -Y to enable "Trusted" mode for X11, which will enable complete access to your X11 server.
answered Apr 1 '12 at 9:16
grawitygrawity
245k37516576
add a comment |
Using -X, X11 forwarding is enabled in "Untrusted" mode, making use of various X11 security extensions, including a time-limited Xauth cookie.
Use -Y to enable "Trusted" mode for X11, which will enable complete access to your X11 server.
answered Apr 1 '12 at 9:16
grawitygrawity
245k37516576
Using -X, X11 forwarding is enabled in "Untrusted" mode, making use of various X11 security extensions, including a time-limited Xauth cookie.
Use -Y to enable "Trusted" mode for X11, which will enable complete access to your X11 server.
answered Apr 1 '12 at 9:16
grawitygrawity
245k37516576
answered Apr 1 '12 at 9:16
grawitygrawity
245k37516576
answered Apr 1 '12 at 9:16
grawitygrawity
245k37516576
answered Apr 1 '12 at 9:16
grawitygrawity
245k37516576
245k37516576
add a comment |
add a comment |
The default ForwardX11Timeout is 20 minutes for ssh -X, but you can set it to something large (e.g. 7d for 7 days) in .ssh/config
"Trusted" X11 forwarding via ssh -Y actually enables potentially nasty things like keystroke monitoring and screen grabs.
answered Nov 18 '12 at 3:08
BobBob
26133
3
man ssh_configfor this option documentation :)
– drAlberT
May 27 '13 at 16:17
add a comment |
The default ForwardX11Timeout is 20 minutes for ssh -X, but you can set it to something large (e.g. 7d for 7 days) in .ssh/config
"Trusted" X11 forwarding via ssh -Y actually enables potentially nasty things like keystroke monitoring and screen grabs.
answered Nov 18 '12 at 3:08
BobBob
26133
3
man ssh_configfor this option documentation :)
– drAlberT
May 27 '13 at 16:17
add a comment |
The default ForwardX11Timeout is 20 minutes for ssh -X, but you can set it to something large (e.g. 7d for 7 days) in .ssh/config
"Trusted" X11 forwarding via ssh -Y actually enables potentially nasty things like keystroke monitoring and screen grabs.
answered Nov 18 '12 at 3:08
BobBob
26133
The default ForwardX11Timeout is 20 minutes for ssh -X, but you can set it to something large (e.g. 7d for 7 days) in .ssh/config
"Trusted" X11 forwarding via ssh -Y actually enables potentially nasty things like keystroke monitoring and screen grabs.
answered Nov 18 '12 at 3:08
BobBob
26133
answered Nov 18 '12 at 3:08
BobBob
26133
answered Nov 18 '12 at 3:08
BobBob
26133
answered Nov 18 '12 at 3:08
BobBob
26133
26133
3
man ssh_configfor this option documentation :)
– drAlberT
May 27 '13 at 16:17
add a comment |
3
man ssh_configfor this option documentation :)
– drAlberT
May 27 '13 at 16:17
3
3
man ssh_config for this option documentation :)– drAlberT
May 27 '13 at 16:17
man ssh_config for this option documentation :)– drAlberT
May 27 '13 at 16:17
add a comment |
(would comment on Bob's 2012-11-18 answer, but it won't let me yet)
See also https://unix.stackexchange.com/questions/107547/disable-forwardx11timeout-without-forwardx11trusted-in-openssh-client in which we find that you cannot (in 2019) disable this timeout, but you can extend it.
The maximum timeout is uint_max of milliseconds minus some slack, just over 24 days. OpenSSH_7.4p1 will accept ssh -o ForwardX11Timeout=2147423s -X ... which is the best answer I can make now. ForwardX11Timeout above this may crash the XServer in some version combinations.
On MacOS with XQuartz, I have seen Warning: untrusted X11 forwarding setup failed: xauth key data not generated and upon digging further, /opt/X11/bin/xauth: timeout in locking authority file /var/folders/..../xauthfile .
answered 16 hours ago
mcastmcast
1
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mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
(would comment on Bob's 2012-11-18 answer, but it won't let me yet)
See also https://unix.stackexchange.com/questions/107547/disable-forwardx11timeout-without-forwardx11trusted-in-openssh-client in which we find that you cannot (in 2019) disable this timeout, but you can extend it.
The maximum timeout is uint_max of milliseconds minus some slack, just over 24 days. OpenSSH_7.4p1 will accept ssh -o ForwardX11Timeout=2147423s -X ... which is the best answer I can make now. ForwardX11Timeout above this may crash the XServer in some version combinations.
On MacOS with XQuartz, I have seen Warning: untrusted X11 forwarding setup failed: xauth key data not generated and upon digging further, /opt/X11/bin/xauth: timeout in locking authority file /var/folders/..../xauthfile .
answered 16 hours ago
mcastmcast
1
New contributor
mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
(would comment on Bob's 2012-11-18 answer, but it won't let me yet)
See also https://unix.stackexchange.com/questions/107547/disable-forwardx11timeout-without-forwardx11trusted-in-openssh-client in which we find that you cannot (in 2019) disable this timeout, but you can extend it.
The maximum timeout is uint_max of milliseconds minus some slack, just over 24 days. OpenSSH_7.4p1 will accept ssh -o ForwardX11Timeout=2147423s -X ... which is the best answer I can make now. ForwardX11Timeout above this may crash the XServer in some version combinations.
On MacOS with XQuartz, I have seen Warning: untrusted X11 forwarding setup failed: xauth key data not generated and upon digging further, /opt/X11/bin/xauth: timeout in locking authority file /var/folders/..../xauthfile .
answered 16 hours ago
mcastmcast
1
New contributor
mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
(would comment on Bob's 2012-11-18 answer, but it won't let me yet)
See also https://unix.stackexchange.com/questions/107547/disable-forwardx11timeout-without-forwardx11trusted-in-openssh-client in which we find that you cannot (in 2019) disable this timeout, but you can extend it.
The maximum timeout is uint_max of milliseconds minus some slack, just over 24 days. OpenSSH_7.4p1 will accept ssh -o ForwardX11Timeout=2147423s -X ... which is the best answer I can make now. ForwardX11Timeout above this may crash the XServer in some version combinations.
On MacOS with XQuartz, I have seen Warning: untrusted X11 forwarding setup failed: xauth key data not generated and upon digging further, /opt/X11/bin/xauth: timeout in locking authority file /var/folders/..../xauthfile .
answered 16 hours ago
mcastmcast
1
New contributor
mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 16 hours ago
mcastmcast
1
New contributor
mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 16 hours ago
mcastmcast
1
answered 16 hours ago
mcastmcast
1
1
New contributor
mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
mcast is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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Is the X server still running? Do existing X apps get killed?
– Ignacio Vazquez-Abrams
Apr 1 '12 at 8:01