Host: CentOS 8 Stream / Client: Windows 10 Powershell (exactly Windows Terminal)

enable_GUI_within_SSH.sh

#!/bin/bash

# Host: CentOS 8 (192.168.8.119)
# Client: Windows 10 Powershell (192.168.8.120)
# ssh -Y [email protected]

# Before Begin in Client(Windows)
# 1. Install VcXsrv (https://sourceforge.net/projects/vcxsrv/)
# 2. Execute Xlaunch.exe
#    Check {Multiple Windows and Display number = -1, Start no client, {Clipboard, Primary Selection, Native opengl, Additional parameter: "-ac"} -> Save Configuration}
# 3. Turn on Powershell
#    > Set-NetFirewallRule -DisplayName "Xming X Server" -Enabled True -Profile Any # I don't know why DisplayName is "Xming". But it works....
#    > $Env:DISPLAY = "localhost:0.0"
# Caution. Keyword is "X11". If there is trouble, do
#          > ssh -Y -v [email protected] # -v means verbose
#          and Check outputs.

dnf install -y epel-release openssh-server xauth

systemctl stop firewalld
sed -i 's/# Host */Host */g' /etc/ssh/ssh_config
sed -i 's/#   ForwardAgent no/    ForwardAgent yes/g' /etc/ssh/ssh_config
sed -i 's/#   ForwardX11 no/    ForwardX11 yes/g' /etc/ssh/ssh_config

sed -i 's/#X11Forwarding no/X11Forwarding yes/g' /etc/ssh/sshd_config
sed -i 's/#X11Forwarding no/X11Forwarding yes/g' /etc/ssh/sshd_config
sed -i 's/#Compression delayed/Compression yes/g' /etc/ssh/sshd_config
systemctl restart sshd

echo "# Xming" >> ~/.bash_profile
echo "export DISPLAY=127.0.0.1:10.0" >> ~/.bash_profile

xauth add 192.168.8.120:0 . 0123456789abcdef0123456789abcdef # That IP address is Client's IP

reboot now
# After reboot and login within below command
# > ssh -Y -v [email protected]
# [root@localhost ~]# gedit # for checking X11 Forwarding well (GUI)