Securing a Linux machine
I have a Linux machine at home and I'm wondering if there is anything I can do to protect the machine against attacks. I have iptables up and running, blocking all ports except 23 (ssh), 80 (http) and a few other, i.e. for Samba. It is open to the internet because it is running a web site. My worry is that I've left a back door open and that a spammer will hijacked my machine to do his dirty deed.
Any hints and tips welcome.
Regards
Stoney