A remote Linux / UNIX server can be rebooted using following methods:
A) Login to remote server using ssh as root user and use any one of the following syntax:
ssh root@remote-server-ip
OR
ssh root@remote-server-name
When prompted for password please supply remote server root password.
B) Type reboot command as follows:
reboot
You can also save time using the following reboot command over ssh session:
ssh root@202.54.10.20 reboot
ssh root@webserver.nixcraft.net reboot