how to protect a linux server ubuntu 10?

July 13, 2010 at 12:34:13
Specs: linux ubuntu
i just install 10.04 server then citadel email server , all works ok
but i m worry about security , i know a guy who told me every server should have a guest login $ then after i m in , i can have access to root . that way if someone can break in they wont have root access right away.
also i would like a nice setting with iptables

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July 13, 2010 at 12:43:07
Sounds like you have a lot of reading to do!

First, the guy you know is right. You should always restrict root logins and use sudo to provide root access. That's a good start.

Here's a guide to securing Debian (the distro on which Ubuntu is based). It covers a lot, and won't always be 100% applicable to your distro, but it has a lot of background information that will be enormously helpful later.

Here is some info on IPtables

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