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X11 forwarding and .Xauthority file

X client forwarded over SSH “cannot open display: localhost:11.0”“su” with error “X11 connection rejected because of wrong authentication”No xauth data; using fake authentication. Unable to display remote windows.Xauthority file is emptyUnderstanding ssh X11 forwardingssh x11 forwarding drag-and-drop“Invalid MIT-MAGIC-COOKIE-1 key” when trying to run program remotelyCygwin/X DISPLAY number no longer :0?Encrypted Home Directory and SSH (Key-Only-Authentication) breaks X11 forwardingHow to generate a new Xauthority with no home?

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I've looked around for an answer to this question off and on for the past few weeks, but none of the solutions I've seen have worked for me. I've tried deleting the .Xauthority file in both locations.
I use Cygwin X to access another computer. Recently X11 forwarding hasn't been working. After starting the X server on my local machine:

[local]$ export DISPLAY=0.0    

[local]$ ssh -XY user@remotelocation

Warning: No xauth data; using fake authentication data for X11 forwarding.

I'm not sure if this is helpful, but:

[remote]$ xauth list

location/unix:10 MIT-MAGIC-COOKIE-1 304eb389beb66bf44ae6bc1821bdf472

Finally, the problem occurs here:

[remote]$ gedit file &

X11 connection refused because of wrong authentication.

I've always received the "no xauth data; using fake authentication" warning, but recently the X11 connection has been refused as a result. Do you have any suggestions?

ssh x11 xforwarding xauth

share|improve this question

edited Nov 24 '17 at 21:16

Gilles

549k13111191632

asked Nov 24 '17 at 20:41

luminessenceluminessence

612

bumped to the homepage by Community♦ 32 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Welcome to U&L. Please edit your question here by adding the output of grep -v '^#' /etc/ssh/ssh_config
  
  – GAD3R
  Nov 24 '17 at 21:00
  
  
  

  
  
  
  

add a comment | 

1

1

I've looked around for an answer to this question off and on for the past few weeks, but none of the solutions I've seen have worked for me. I've tried deleting the .Xauthority file in both locations.
I use Cygwin X to access another computer. Recently X11 forwarding hasn't been working. After starting the X server on my local machine:

[local]$ export DISPLAY=0.0    

[local]$ ssh -XY user@remotelocation

Warning: No xauth data; using fake authentication data for X11 forwarding.

I'm not sure if this is helpful, but:

[remote]$ xauth list

location/unix:10 MIT-MAGIC-COOKIE-1 304eb389beb66bf44ae6bc1821bdf472

Finally, the problem occurs here:

[remote]$ gedit file &

X11 connection refused because of wrong authentication.

I've always received the "no xauth data; using fake authentication" warning, but recently the X11 connection has been refused as a result. Do you have any suggestions?

ssh x11 xforwarding xauth

share|improve this question

edited Nov 24 '17 at 21:16

Gilles

549k13111191632

asked Nov 24 '17 at 20:41

luminessenceluminessence

612

bumped to the homepage by Community♦ 32 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Welcome to U&L. Please edit your question here by adding the output of grep -v '^#' /etc/ssh/ssh_config
  
  – GAD3R
  Nov 24 '17 at 21:00
  
  
  

  
  
  
  

add a comment | 

I've looked around for an answer to this question off and on for the past few weeks, but none of the solutions I've seen have worked for me. I've tried deleting the .Xauthority file in both locations.
I use Cygwin X to access another computer. Recently X11 forwarding hasn't been working. After starting the X server on my local machine:

[local]$ export DISPLAY=0.0    

[local]$ ssh -XY user@remotelocation

Warning: No xauth data; using fake authentication data for X11 forwarding.

I'm not sure if this is helpful, but:

[remote]$ xauth list

location/unix:10 MIT-MAGIC-COOKIE-1 304eb389beb66bf44ae6bc1821bdf472

Finally, the problem occurs here:

[remote]$ gedit file &

X11 connection refused because of wrong authentication.

I've always received the "no xauth data; using fake authentication" warning, but recently the X11 connection has been refused as a result. Do you have any suggestions?

ssh x11 xforwarding xauth

share|improve this question

edited Nov 24 '17 at 21:16

Gilles

549k13111191632

asked Nov 24 '17 at 20:41

luminessenceluminessence

612

[local]$ export DISPLAY=0.0    

[local]$ ssh -XY user@remotelocation

Warning: No xauth data; using fake authentication data for X11 forwarding.

[remote]$ xauth list

location/unix:10 MIT-MAGIC-COOKIE-1 304eb389beb66bf44ae6bc1821bdf472

[remote]$ gedit file &

X11 connection refused because of wrong authentication.

share|improve this question

edited Nov 24 '17 at 21:16

Gilles

549k13111191632

asked Nov 24 '17 at 20:41

luminessenceluminessence

612

share|improve this question

edited Nov 24 '17 at 21:16

Gilles

549k13111191632

asked Nov 24 '17 at 20:41

luminessenceluminessence

612

edited Nov 24 '17 at 21:16

Gilles

549k13111191632

edited Nov 24 '17 at 21:16

Gilles

549k13111191632

asked Nov 24 '17 at 20:41

luminessenceluminessence

612

asked Nov 24 '17 at 20:41

luminessenceluminessence

612

1 Answer
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oldest

votes

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I've tried deleting the .Xauthority file in both locations.

Maybe something went wrong before that, but you certainly aren't going to succeed after this. If you found this advice somewhere, and they weren't referring to some extremely unusual circumstance that doesn't apply to you, blacklist that source. Restore the .Xauthority file on the client.

If you've lost the .Xauthority file, you may be able to restore it from a running process or from a temporary file. I have no idea how to do it with Cygwin. The simple way that will work everywhere is to quit the X server and start a new one.

If you get the message “no xauth data; using fake authentication”, then remote applications aren't going to be able to display on your local server unless it's configured with security turned off. Without the security of xauth, anybody can spy on your X session and inject input if they can access the X server; depending on the configuration, they may need to be local users (in which case it isn't so bad on a single-user operating system) or it may be enough that they can open a TCP connection to your machine (i.e. they're in your local network, which could be anybody if you're e.g. using public wifi). If it used to work and no longer does, it may be because some missing security check was recently fixed.

Once you have a valid .Xauthority file, open a shell and check that you can run local applications such as gedit. From that same shell, run ssh -X user@remotelocation and try running an X application. Either that will work or you'll get error messages; read them, and copy-paste them if you ask for help. If it doesn't work, run ssh -vv -X user@remotelocation; the extra debugging output will give some information as to why it doesn't work.

Do make sure that the server allows remote X connections. With OpenSSH, the file /etc/sshd_config (or /etc/ssh/sshd_config or some other location depending on the distribution) must contain X11Forwarding yes.

share|improve this answer

answered Nov 24 '17 at 21:15

GillesGilles

549k13111191632

add a comment | 

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0

I've tried deleting the .Xauthority file in both locations.

Maybe something went wrong before that, but you certainly aren't going to succeed after this. If you found this advice somewhere, and they weren't referring to some extremely unusual circumstance that doesn't apply to you, blacklist that source. Restore the .Xauthority file on the client.

If you've lost the .Xauthority file, you may be able to restore it from a running process or from a temporary file. I have no idea how to do it with Cygwin. The simple way that will work everywhere is to quit the X server and start a new one.

If you get the message “no xauth data; using fake authentication”, then remote applications aren't going to be able to display on your local server unless it's configured with security turned off. Without the security of xauth, anybody can spy on your X session and inject input if they can access the X server; depending on the configuration, they may need to be local users (in which case it isn't so bad on a single-user operating system) or it may be enough that they can open a TCP connection to your machine (i.e. they're in your local network, which could be anybody if you're e.g. using public wifi). If it used to work and no longer does, it may be because some missing security check was recently fixed.

Once you have a valid .Xauthority file, open a shell and check that you can run local applications such as gedit. From that same shell, run ssh -X user@remotelocation and try running an X application. Either that will work or you'll get error messages; read them, and copy-paste them if you ask for help. If it doesn't work, run ssh -vv -X user@remotelocation; the extra debugging output will give some information as to why it doesn't work.

Do make sure that the server allows remote X connections. With OpenSSH, the file /etc/sshd_config (or /etc/ssh/sshd_config or some other location depending on the distribution) must contain X11Forwarding yes.

share|improve this answer

answered Nov 24 '17 at 21:15

GillesGilles

549k13111191632

add a comment | 

0

I've tried deleting the .Xauthority file in both locations.

Maybe something went wrong before that, but you certainly aren't going to succeed after this. If you found this advice somewhere, and they weren't referring to some extremely unusual circumstance that doesn't apply to you, blacklist that source. Restore the .Xauthority file on the client.

If you've lost the .Xauthority file, you may be able to restore it from a running process or from a temporary file. I have no idea how to do it with Cygwin. The simple way that will work everywhere is to quit the X server and start a new one.

If you get the message “no xauth data; using fake authentication”, then remote applications aren't going to be able to display on your local server unless it's configured with security turned off. Without the security of xauth, anybody can spy on your X session and inject input if they can access the X server; depending on the configuration, they may need to be local users (in which case it isn't so bad on a single-user operating system) or it may be enough that they can open a TCP connection to your machine (i.e. they're in your local network, which could be anybody if you're e.g. using public wifi). If it used to work and no longer does, it may be because some missing security check was recently fixed.

Once you have a valid .Xauthority file, open a shell and check that you can run local applications such as gedit. From that same shell, run ssh -X user@remotelocation and try running an X application. Either that will work or you'll get error messages; read them, and copy-paste them if you ask for help. If it doesn't work, run ssh -vv -X user@remotelocation; the extra debugging output will give some information as to why it doesn't work.

Do make sure that the server allows remote X connections. With OpenSSH, the file /etc/sshd_config (or /etc/ssh/sshd_config or some other location depending on the distribution) must contain X11Forwarding yes.

share|improve this answer

answered Nov 24 '17 at 21:15

GillesGilles

549k13111191632

add a comment | 

I've tried deleting the .Xauthority file in both locations.

Maybe something went wrong before that, but you certainly aren't going to succeed after this. If you found this advice somewhere, and they weren't referring to some extremely unusual circumstance that doesn't apply to you, blacklist that source. Restore the .Xauthority file on the client.

If you've lost the .Xauthority file, you may be able to restore it from a running process or from a temporary file. I have no idea how to do it with Cygwin. The simple way that will work everywhere is to quit the X server and start a new one.

If you get the message “no xauth data; using fake authentication”, then remote applications aren't going to be able to display on your local server unless it's configured with security turned off. Without the security of xauth, anybody can spy on your X session and inject input if they can access the X server; depending on the configuration, they may need to be local users (in which case it isn't so bad on a single-user operating system) or it may be enough that they can open a TCP connection to your machine (i.e. they're in your local network, which could be anybody if you're e.g. using public wifi). If it used to work and no longer does, it may be because some missing security check was recently fixed.

Once you have a valid .Xauthority file, open a shell and check that you can run local applications such as gedit. From that same shell, run ssh -X user@remotelocation and try running an X application. Either that will work or you'll get error messages; read them, and copy-paste them if you ask for help. If it doesn't work, run ssh -vv -X user@remotelocation; the extra debugging output will give some information as to why it doesn't work.

Do make sure that the server allows remote X connections. With OpenSSH, the file /etc/sshd_config (or /etc/ssh/sshd_config or some other location depending on the distribution) must contain X11Forwarding yes.

share|improve this answer

answered Nov 24 '17 at 21:15

GillesGilles

549k13111191632

share|improve this answer

answered Nov 24 '17 at 21:15

GillesGilles

549k13111191632

answered Nov 24 '17 at 21:15

GillesGilles

549k13111191632

answered Nov 24 '17 at 21:15

GillesGilles

549k13111191632