02.Don't make games SUID ROOT !!!
03.Limit the number of SUID root programs on your system.
04.Run programs at Least Privilege Access.
05.Disable services you don't need or use.
06.Make sure to have the latest /lib's.
07.Encrypt that connection.
08.Keep your Kernel current to the latest and stable.
09.When Configuring your kernel only compile in code you need
and use.
10.Let outsiders know as little as possible about your system.
11.Enforce good passwords.
12.If you can, limit who can connect to your Linux box.