When I tried to start chromium, I had error messages :

$ chromium
X11 connection rejected because of wrong authentication.
[10139:10139:0321/173002.675673:ERROR:ozone_platform_x11.cc(234)] Missing X server or $DISPLAY
[10139:10139:0321/173002.675976:ERROR:env.cc(225)] The platform failed to initialize.  Exiting.
$ echo $DISPLAY
localhost:10.0

$ xterm # xterm starts fine

I have a Ubuntu VM on VirtualBox running in headless mode. Host is a Windows 10 machine. I want to be able to render Ubuntu's applications on Windows using XServer. Currently, I tried this: - Installed X410 XServer on Windows. - ssh into Virtual Machine with a -X option so that X forwarding is enabled. - If I run a graphical application from command line now, it complains that cannot connect XServer. My DISPLAY env variable is localhost:10.0. Below is error I get on launching the graphical application: connect /tmp/.X11-unix/X0: No such file or directory Unable to init server: Could not connect: Connection refused Failed to parse arguments: Cannot open display:

I have Void Linux with openssh-9.9p2_1 on my laptop. And Raspberry PI Zero 2W with Raspbian Bullseye and openssh 1:8.4p1-5+deb11u3. I want to use the Raspberry Pi Zero to read data from the CAN bus in my car over wifi network. I have been reading and suspect I may have server and client confused. Raspberry Pi has no xorg-server installed. I have a C++ program with a gui installed my laptop that runs Openbox, that I want to run on the Pi to connect via a CAN hat. On laptop in /etc/ssh/ssh_config:

ForwardAgent yes
   ForwardX11 yes

On the Pi in /etc/ssh/sshd_config:

X11Forwarding yes
X11DisplayOffset 10

Struggling to understand how to run anything over ssh -X, On xterm on my laptop have tried with simple ssh -v -X scan@192.xxx.x.xxx xeyes and get (among other stuff)

debug1: Sending command: xeyes
bash: line 1: xeyes: command not found

Do the versions of openssh matter? Should my laptop be server or client? Or am I starting the executable incorrectly? Please help a stupid guy :-)

I'm using X11 forwarding to use GUI apps from my headless remote server. Everything was fine until I needed to use a program that needs system tray. Program needs a system tray to work correctly otherwise GUI doesn't show up. How can I run a GUI program that needs a system tray through X11 forwarding?

I am trying to figure out how to forward X11 over ssh without using -Y. Both systems run the latest version of stock arch linux with the yay aur helper. The server runs xorg with KDE plasma and the client runs xorg with i3wm, neither run wayland. Both the client and server have extra/xorg-xauth installed. The ssh server runs sddm while the ssh client runs lightdm When I run ssh user@ip -X it complains that the client does not have a ~/.Xauthority file present. This is because sddm sets the file in /tmp/xauth_XXX where XXX changes every boot. $XAUTHORITY it set to the correct path to the file yet ssh (or sshd) ignores this value in favor of the lightdm ~/.Xauthority. How do I force ssh to use the file pointed to by $XAUTHORITY. According to xauth(1) > By default, xauth will use the file specified by the XAUTHORITY environment variable or .Xauthority in the user's home directory. Meaning that $XAUTHORITY should be recognized properly I do have access to root on both client and server for configuration.

I have a Milk-V Duo S running an image of Debian specifically designed to run on the Sophgo SG2000 chip, made by Fishwaldo. I'm able to ssh -X into it via my Manjaro machine (which uses KDE Plasma) and was able to get the board to display basic apps like xcalc, xclock, and xeyes. From there I tried installing mwm and launching it to see if I could forward an entire graphical desktop, but got the error a window manager is already running on screen 0 Which I presume is the KDE Plasma desktop running on my main monitor. That begs the question, how do I get around this? Do I need to turn off KDE Plasma and go directly to the command line or can I have it forwarded into another window of sorts?

I'm running a Ubuntu server in VMWare. And I would like to forward the X11 from the Ubuntu guest to the Mac host. I've installed XQuartz 2.7.9 (xorg-server 1.17.4) on the Mac host. And SSH forwarding on the Ubuntu is enabled. Then I tried the following in iTerm: %> echo $DISPLAY /private/tmp/com.apple.launchd.mjxVyILVrR/org.macosforge.xquartz:0 %> ssh -X root@xxxx # echo $DISPLAY # gnome-terminal Unable to init server: Could not connect: Connection refused Failed to parse arguments: Cannot open display $DISPLAY is empty, and X11 forwarding is not working. Any ideas?

I have a machine running Ubuntu which I SSH to from my Fedora 14 machine. I want to forward X from the Ubuntu machine back to Fedora so I can run graphical programs remotely. Both machines are on a LAN. I know that the -X option enables X11 forwarding in SSH, but I feel like I am missing some of the steps. What are the required steps to forward X from a Ubuntu machine to Fedora over SSH?

I am trying to run Blender 3.6.5 in a remote server using x-forwarding. The server as installed the base x11 and mesa packages, as well as freetype package.

-shellsession
user@server:~$ sudo apt install -y
		bzip2 libfreetype6 libgl1-mesa-dev \
		libglu1-mesa \
        fontconfig \
		libxi6 libxrender1 libglib2.0-0 x11-utils

I connect to the server using ssh client, and defining the x11 forwarding option.

-shellsession
user@client$ ssh -X -v user@server

I tryed to run _glxgears_ and it works properly, but when I run blender, it crashes with an error that I do not understand.

-shellsession
user@server:~/blender-3.6.5-linux-x64$ ./blender
0debug1: client_input_channel_open: ctype x11 rchan 3 win 65536 max 16384
debug1: client_request_x11: request from 127.0.0.1 60744
debug1: channel 1: new [x11]
debug1: confirm x11
Failed to open dir (No such file or directory): /run/user/7693/gvfs/
X Error of failed request:  BadGC (invalid GC parameter)
  Major opcode of failed request:  60 (X_FreeGC)
  Resource id in failed request:  0x6e00025
  Serial number of failed request:  218
  Current serial number in output stream:  223
debug1: channel 1: FORCE input drain

Is there any other thing that I need to consider to run Blender remotely? (fonts or specific libraries for example)

I have a server running XFCE on debian and a client running gnome3 on arch, and I want to control GUI applications running on server from client using X11 forwarding. ssh -X user@server on the client followed by localc - Works! Except every few seconds no matter what I do - even moving the window - gnome tells me "Libreoffice Calc is not responding. Do you want to force quit it?". This happens with the calculator too, anything. Yeah I admit there is a slight lag (a guessed 0.3 seconds - Can this be improved somehow?) but it's definitely not unresponsive. The dialog comes up every few seconds. Nothing's frozen or anything. Edit: Setting gsettings set org.gnome.mutter check-alive-timeout 20000 still shows the dialog, just now only every 20 seconds even though nothing is unresponsive at all. Setting it to 0 to disbale it worked, but I'd sure like to find and fix the real issue causing gnome to think it's unresponsive when it isn't.

I got the following error message when I use ssh -v -Y. The server OS is mojave. Does anybody know what is wrong?

debug1: No xauth program.
Warning: No xauth data; using fake authentication data for X11 forwarding.
debug1: Requesting X11 forwarding with authentication spoofing.
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
debug1: Remote: No xauth program; cannot forward X11.
X11 forwarding request failed on channel 0

Consider a situation where I'm logging in over SSH from machine A to machine B, I have an X session on machine A, and I want to run an X program on B. [ssh -X B makes this work transparently.](https://unix.stackexchange.com/questions/12755/how-to-forward-x-over-ssh-from-ubuntu-machine) But what if the server configuration lacks X11Forwarding yes, I don't have root permissions on the server, and the server administrator is indifferent? It's obviously possible to forward the X11 connection, since I can transfer whatever I want over the SSH channel. In fact, if the local X server allows TCP connections, it's as easy as ssh -R 6010:localhost:6000 (to be adjusted for the display numbers). What about the common case where the local X server only allows socket connections? How do I do X forwarding conveniently and securely, with a minimum of installation requirements (especially on B)?

When I ssh -X to a server, I will be assigned a $DISPLAY value, usually localhost:x.0 where x is the lowest number unused by all the users starting from 10. (e.g., if no other user uses $DISPLAY, then it is 10. If some user is already using 10, then it will be 11, etc) Now my question is: is there a way to specify a number for x when doing ssh -X, like 100. My purpose is to have a detached program keeping running on the server that always use localhost:100.0 as its display. Then even if I lost the X connection to the server, I can re-login and still establish a connection to localhost:100.0 without worrying about other users occupying the same port during my disconnection. Choose a number as big as 100 can avoid most of the possibilities that it get occupied, comparing to the default 10.

From my local machine I ssh to a remote server along with authentication regarding X display. I know that in this process, MIT-MAGIC-COOKIES are used and the value in both server and client needs to be identical in order for the authentication process to be valid. However, when I login to a remote server and have confirmed that X display stuff are working well (e.g. executing xclock to see if the xclock application is popped up in my local machine), when I check the value of the cookies, the value in local machine and that in the remote server seems to be different. Here's the command lines: ### cookie value in remote server chulhyun@chulhyun-Inspiron-3420:~$ ssh -X Black@$labcom Last login: Wed Jun 25 10:02:25 2014 from Black@Black-PC ~ $ xclock ### xclock appears in local machine. Black@Black-PC ~ $ xauth list Black-PC/unix:10 MIT-MAGIC-COOKIE-1 708f623489b1ea129a77e98287d130ca ### cookie value in local machine chulhyun@chulhyun-Inspiron-3420:~$ xauth list chulhyun-Inspiron-3420/unix:0 MIT-MAGIC-COOKIE-1 5ddd2ce92004eab53ceee8a64b7b88c0 As you can see the cookie value in two machines are different. Then shouldn't the X display not work? What am I missing here? P.S. I heard that $XAUTHORITY contains the path to the xauthority file and I've checked that path in local machine: chulhyun@chulhyun-Inspiron-3420:~$ echo $XAUTHORITY /var/run/gdm/auth-for-chulhyun-iZfH2u/database When I take a look into the "database" file, the contents are unreadable because the contents are composed of weird characters. ^A^@^@^Vchulhyun-Inspiron-3420^@^A0^@^RMIT-MAGIC-COOKIE-1^@^P]?,? ^D??xhost and $XAUTHORITY in remote server** Black@Black-PC ~ $ xhost access control enabled, only authorized clients can connect SI:localuser:chulhyun Black@Black-PC ~ $ echo $XAUTHORITY *as it turns out $XAUTHORITY is not defined... is this normal? **result of xhost in local machine** chulhyun@chulhyun-Inspiron-3420:~$ xhost access control enabled, only authorized clients can connect SI:localuser:chulhyun

I usually work in an X-forwarded GNOME Terminal session, which I launch like this:

local-machine$ ssh -X remote-machine gnome-terminal

I do this instead of running SSH in my local terminal because it means that new tabs will open on the remote host in the same directory ([related unresolved question](https://unix.stackexchange.com/questions/729995/how-can-i-configure-gnome-terminal-to-launch-new-tabs-with-the-same-ssh-host-and)) . I've noticed that when I try to launch a GUI program from this X-forwarded terminal, it fails, e.g.

remote-machine$ gedit

(gedit:49577): Gtk-WARNING **: 14:32:45.928: cannot open display: localhost:13.0

However, if I also run a separate X-forwarded shell session (and just leave it sitting there):

local-machine$ ssh -X remote-machine

then I can run GUI apps like gedit in the X-forwarded GNOME Terminal instance. Why does this work-around work? Is there a simpler way to do this (e.g. a flag that I can add to the ssh -X remote-machine gnome-terminal command)?

I have a very little experience in linux, but these days, I was trying to understand a bit more about ssh and X forwarding. I use an SBC (orange pi zero 2) as a home server under debian. I usually ssh -X to my server from mobaXterm on a windows 11 PC. Everything runs smoothly and I have no problem opening a window on my local machine (gvim for instance). However I was just curious about one thing: my DISPLAY variable is set to localhost:10 (which I expected), but xauth list only show an entry for myserver/unix:10, which is a unix socket, as far as I understand. So I was wondering why (and, above all, if) X authentication is actually working... Most of my knowledge on these things com from this very interesting page and I assumed xauth list would have shown an entry for my DISPLAY variable (a TCP socket). Thanks!!

While installing Ubuntu 16.04 I decided to take the option of encrypting my home directory. I also use ssh key-only authorization, as password logins are disabled for security. I was able to solve the "not being able to log in because .ssh/authorized_keys" issue using this: https://stephen.rees-carter.net/thought/encrypted-home-directories-ssh-key-authentication . In summary: sudo vim ~/.profile and then entering ecryptfs-mount-private cd /home/username But now, X11 forwarding over ssh is broken. It appears the MMC (MIT Magic Cookie) .Xauthority file is not making it into the un-encrypted home directory.

Usually I do this on ssh for getting a X application using sudo su ssh -X server OKI login xauth list $DISPLAY which returns to me server/unix:10 MIT-MAGIC-COOKIE-1 blablablablabla Then I do sudo su xauth add server/unix:10 MIT-MAGIC-COOKIE-1 blablablablabla And after running an X application..I get it, it is correct. The problem is on Centos7, I do xauth list $DISPLAY And it returns nothing. I try to add MIT magic cookies given by xauth list But of course it doesn't work. The normal X-forwarding via ssh, without sudo works. The settings of sshd are the same on 3 servers: 1. slackware *WORKS* 2. hpux *WORKS* 3. centos7 ***NOT WORKING***

I have a headless VM (running Ubuntu server 17.04) that I use SSH to access. I'm comfortable with the basics of X11 forwarding, and I can forward xterm and friends just fine. XFCE terminal also forwards OK. I'd like to be able to use Gnome terminal, but it doesn't seem to launch. Instead, it just hangs for awhile and eventually errors out with: Error constructing proxy for org.gnome.Terminal:/org/gnome/Terminal/Factory0: Error calling StartServiceByName for org.gnome.Terminal: Timeout was reached Interestingly, gnome-terminal works remotely over X11 if I have a local desktop session running on my VM (launched via startx). I'm guessing there's some kind of Gnome service that needs to be running, but I can't figure out what it is or how to start it outside of the context of a full desktop session. I don't usually launch those because the VM is headless by default. Anybody got some insight on what I could do to get Gnome-terminal working remotely without having to start a GUI desktop session locally on my VM?

I've been using X11 forwarding to "seamlessly" work on two machines at the same time and it's been working great. The one issue that I'm having is that the connection can be quite slow for some applications and I would like to speed it up. Since both machines are on my private home network I don't really care about the connection being secure, so my first approach was to either disable encryption or switching to a weaker cipher. After a google search I found that I could get noticeably better performance by enabling trusted X11 forwarding (-Y) and compression (-C). However it appears that the weak but fast ciphers (arcfour and blowfish) have been removed from openssh a few versions ago. So my questions are? 1. Is it possible to enable/install these ciphers? 2. If not, which of the currently available ciphers are the fastest? 3. Are there any other settings that can be adjusted to speedup the connection? EDIT: The remote pc is running Ubuntu 20.04 and the local is running Pop!_OS 19.10 (Based on Ubuntu 19.10). Both use GDM3 as their window manager.