CODEWITHSUNDEEP
x11-forwarding
A. Koenig
A. Koenig

Reputation: 191

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

I have an unfortunate problem when making ssh connections from Fedora 23 to Centos 7. The commands ssh -X user@centos7 and ssh -Y user@centos7 both print Warning: No xauth data; using fake authentication data for X11 forwarding.

Googling shows to add the following lines to /etc/ssh/ssh_config:

Host *
    ForwardX11Trusted yes
    ForwardAgend yes
    ForwardX11 yes

But this didn't make the warning message go away.

Upvotes: 19

Views: 60679

Answers (4)

Mike Slinn
Mike Slinn

Reputation: 8405

Pipe stderr to a subshell that filters out the message with this incantation:

ssh yourusername@yourhost commandToRun 2> >( sed '/Warning: No xauth data/d')

Nothing to install, nothing to configure, nothing can go wrong!

Upvotes: -1

HeatfanJohn
HeatfanJohn

Reputation: 7323

For me this issue was caused by my Fedora system not having an ~/.Xauthority file.

I created one by executing the following commands on my Fedora system (Client machine):

xauth add :0 . `mcookie`

Upvotes: 25

DestinyOne
DestinyOne

Reputation: 235

Letting Ubuntu bash on Windows 10 run ssh -X to get a GUI environment on a remote server

  • First

Install all of the following. On Windows, install an X server, e.g.Xming. On Ubuntu bash, use sudo apt install to install ssh xauth xorg.

sudo apt install ssh xauth xorg
  • Second

Go to the folder contains ssh_config file, mine is /etc/ssh.

  • Third

Edit ssh_config as administrator(USE sudo). Inside ssh_config, remove the hash # in the lines ForwardAgent, ForwardX11, ForwardX11Trusted, and set the corresponding arguments to yes.

# /etc/ssh/ssh_config

Host *
    ForwardAgent yes
    ForwardX11 yes
    ForwardX11Trusted yes
  • Fourth

In ssh_config file, remove the front hash # before Port 22 and Protocol 2, and also append a new line at the end of the file to state the xauth file location, XauthLocation /usr/bin/xauth, remember write your own path of xauth file.

# /etc/ssh/ssh_config

#   IdentifyFile ...
    Port 22
    Protocol 2
#   Cipher 3des
#   ...
#   ...
    ...
    ...
    GSSAPIDelegateCredentials no
    XauthLocation /usr/bin/xauth
  • Fifth

Now, since we are done editing the ssh_config file, save it when we leave the editor. Now go to folder ~ or $HOME, append export DISPLAY=localhost:0 to your .bashrc file and save it.

# ~/.bashrc
...
...
export DISPLAY=localhost:0
  • Last

We are almost done. Restart your bash shell, open your Xming program and use ssh -X yourusername@yourhost. Then enjoy the GUI environment.

ssh -X yourusername@yourhost

The problem is also in Ubuntu subsystem on Windows, and the link is at

https://gist.github.com/DestinyOne/f236f71b9cdecd349507dfe90ebae776

Upvotes: 11

nmgeek
nmgeek

Reputation: 2187

See https://serverfault.com/a/859370/423488

You might have to add a line like this to /etc/ssh/ssh_config of the client system:

XAuthLocation /opt/X11/bin/xauth

But use the actual path to the xauth program on your client system (where your client system is the one you are running ssh from). You can find the path to xauth with this command:

which xauth

Upvotes: 9

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