Make my Server more secure

[Grub]

How can I make my server more secure and stop hackers from attempting to hack?

[Jordan]

Ban their IP Address when you discover they are trying to hack.

Here is how:

1. Login to your server via SSH and su - to root (do not forget the - after su).

2. After logging in as root, you may want to look at what's already loaded, if anything. To look at the tables that are currently in effect:

(Note: You might need to add "| less" to the end of your iptables -L commands if you have a lot of iptables rules. This will let you view the rules one page at a time. You can use "q" to quit.)

# iptables -L -n

3. To successfully block an IP address, the syntax would be:

# iptables -I INPUT -s IP_ADDRESS_HERE -j DROP

e.g.:

# iptables -I INPUT -s 123.123.123.123 -j DROP

4. To verify that your entry was successful:
(Note: You might need to add "| less" to the end of your iptables -L commands if you have a lot of iptables rules. This will let you view the rules one page at a time. You can use "q" to quit.)

(as root still)

# /sbin/iptables -L -n

5. If you want to flush your IPtables:

# /sbin/iptables -F

You can find other options to choose from with the following command:

# /sbin/iptables --help

Block From: [Linux] Block IP Address using IPtables - Webmaster Forum

[Crop]

Thank you, that should do the trick. I'm also going to setup a Firewall.

I thought that linux was already more secure, but I see that I'm wrong.

[TotalPenguin]

Well I think if you want it to be 100% secure then just disconnect it from the internet and from any form of network.. perhaps even switch it off

Jokes apart.. I too thought that linux was way more than secure, but I too was wrong.. duh.. what a Linux illiterate I am!