Whats steps would you do to secure your linux server?

[Linux Noobie]

would anyone recommend to be what you do to secure your server? commercial server in particular.

[chiaz]

Information on securing your Linux server is readily available on the web. They can be something as simple as changing the root password or disabling suid.

More information available here:
http://www.linuxdevcenter.com/pub/a/linux/2006/03/23/secure-your-server.html
http://tldp.org/LDP/lame/LAME/linux-admin-made-easy/security.html
http://www.sitepoint.com/article/secure-linux-server