Sometimes your server will tell you it needs to be restarted. Usually this happens after it has auto-installed security updates. You might see this notice when you log into the server shell, or when you view the Ares jobs list.
In the server shell:
*** System restart required ***
In the game:
Your operating system is indicating that your server needs to be rebooted - probably to finish installing automatic updates. Please restart the server (not just the game) as soon as you can. You may encounter performance or memory issues until this is done.
shutdowncommand or the Admin->Manage->Shutdown button on the Web Portal.
sudo reboot. (On older linux systems you may need to do
sudo shutdown -r now.)
Your game should restart automatically after the server reboots.
If it does not, check your log files and see if there was an error. If there was no error, your server might not be configured right. See Restarting After a Reboot.