How many of each security software should I use.?

Should I use more than one firewall or will there be compatiblity issues? Should I use more than one anti-virus or will there be compatibility issues? Should I use more than one anti-spyware program (i don't think there will be a compatibility issue but would there be)?

How many of each security software should I use.?firewall

1 firewall - 1 anti-virus and SBS%26D and Ad-Aware will work ok.

How many of each security software should I use.?husqvarna

Step 1:

Don't run anything as root, or use sudo.

Step 2:

Download only trusted updates, signed with the PGP keys.

Step 3:

Use a decent firewall setup like so:

iptables -P INPUT DROP

iptables -A INPUT -m state --state INVALID -j DROP

iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

iptables -A INPUT -p tcp --tcp-flags SYN SYN --tcp-option \! 2 -j DROP
Anti-virus software is notorious for fighting. I've not ever seen two anti-virus programs installed that didn't cause at least a few annoyances. Anti-spyware stuff is usually better behaved, but not always. Firewalls shouldn't really *fight* that much, but will require you to open a hole in both places whenever you want to open something up, and won't really protect you that much more.

The short answer: One anti-virus, one firewall, and a few anti-spyware apps should be just fine.