I forgot to add the authorization key in ssh after restart ssh… but I found a way to bypass it.

So I already Set up Portainer Agent on that server and I can go to my Portainer WebGui to create a CentOS container with these compose docker and add command line to reboot our Host Server. It saves my time.

This will reboot the host, meaning will apply ssh too. So it will work to do then now I can access my host with my SSH PPK files.

version: '3.9'
        command: bash
        image: centos
            - '/proc/sysrq-trigger:/sysrq'
        tty: true
        stdin_open: true

Run this compose then go to exec command to command line

echo b > /sysrq

Here you go, it reboots our host machine. Not docker itself. Which is anything you apply.