Best Security Measures

What are the best security measures you can do to prevent unauthorized attacks on your server. Like I have a Red Hat 7 server. I know of some of the basic security features like a hosts.allow for IP address access.

Anything else you would suggest, maybe a website/guide. I also need to install Mod_gzip on the server to help compress the bandwith.

Any suggestions would be helpful?

Shawn

 

 

 

 

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