I installed debian 12 minimal server following the tutorial found here. My server (a VM) shhould act as a iscsi test server, so I have a 20G HD for OS and a 100G HD as storage Instaling worked well so fine, now I installed gparted to partition the second hd. I login with ssh -X root@server_IP successfull but get error "X11 forwarding request failed on channel 0" my other servers those with and without ISPConfig do not have this problem, they are installed the same way but with older debian versions und upgraded to current debian 11. I can start gparted without any problem X11 is enabled in /etc/ssh/sshd_config What is missing, what ist wrong
The minimal server setup does not install a desktop and with ssh -X, you try to connect to an X desktop, which fails if you do not have a desktop installed. So if this is just a server, which typically has no X desktop, why don't you just connect to ith with ssh to the command line?
none of my servers is install with a desktop. I always follow your tutorials first the minimal server the if needed the perfect server tutorial. Every server a ssh -X user@server_ip works and i can use gparted and others I connect with -X as I some times need thing like gparted thats working sind years at least since debian 8 or 9
List to debug the issue from ChatGPT: The message "SSH: X11 forwarding request failed on channel 0" typically appears when you're trying to use SSH to connect to a remote machine with X11 forwarding, but the remote machine isn't configured correctly to handle it. X11 forwarding is used to run graphical applications on a remote machine while displaying them on your local machine. Here are some common reasons for this error and steps to resolve it: 1. **X11 Forwarding Not Enabled on the Server**: Ensure that the SSH server is configured to allow X11 forwarding. You can do this by editing the SSH server configuration file (`/etc/ssh/sshd_config`) and setting `X11Forwarding yes`. After making changes, restart the SSH server. 2. **Missing or Incorrect X11 Display Variable**: Ensure that the `DISPLAY` environment variable is set correctly on your local machine. This variable tells applications where to send the display output. 3. **Missing xauth Program**: The `xauth` program is needed for X11 forwarding to work. Make sure it is installed on the server. You can usually install it via your distribution's package manager. 4. **Incorrect Permissions on the User's Home or .Xauthority File**: Incorrect permissions on your home directory or the `.Xauthority` file on the server can cause issues. The `.Xauthority` file should have permissions such that it's writable only by the user. 5. **Firewall or Network Issues**: Sometimes, firewalls or network configurations can block the ports used for X11 forwarding. Ensure that the necessary ports are open and not blocked by a firewall. 6. **Client Configuration**: On the client side, ensure that X11 forwarding is requested. This is often done with the `-X` option in the SSH command (`ssh -X username@hostname`). 7. **SSH Client Does Not Have an X Server**: On the client side, especially if you're using Windows, you need an X server like Xming or VcXsrv to display the GUI. 8. **SELinux Restrictions**: If SELinux is enforcing, it might restrict X11 forwarding. You can check the SELinux logs for any denials related to SSH or X11. If these steps don't resolve the issue, you might need to look into the SSH logs on the server for more specific error messages that can help in troubleshooting.
Well you need the client configured properly, the server configured accordingly and make sure that the dependecies like xauth are installed on the server. But you may want to reconsider this whole setup. Why do you need to run gparted on a server? All the tasks can be done with a command line tool like parted.
the DISPLAY variable is missing, but why. sshd_config is identical to the working machines. The client from which I connect is the same, macOS ventura latest version. installation is as I said exactly following your tutorials as always. the only difference the other VMs are running on an ESXi 6.5, these ones on a local VMware Fusion 13 pro, but this should not be a reason and there is an other difference, all other machines a running debian 11 I thing I just have to install something, but what @pyte xauth is installed, parted is not very comfortable, i mostly work on cli and i have not fear from commandline tool, but parted no if there is abetter tool
There are alot of alternative and even TUI tools which provide a "easier" interface on the command line. It's strange to install a GUI application on a server as this installs loads of dependencies. You can find a good list with alternatives here https://wiki.archlinux.org/title/Partitioning#Partitioning_tools cgdisk is a common TUI tool for the job
