Reboot your server
The server will require a reboot to complete some kinds of updates, which will say "Restart Required" by the update's title. Note that OS updates always require a reboot.
To reboot, perform the following steps:
1. Log into the web portal
2. Hover your mouse over "My Servers"
3. Click "Dedicated Servers" from the dropdown menu
4. Click "Actions" on the server you wish to reboot
5. Click "Reboot" to reboot the server
6. Allow the server some time to reboot to finish the process