After experiencing problems with a new internet security software that caused D/C issues.
I've decided would it not be great if there was a list of security software that does not impede on game play.

Ok this is the software that I've used that has caused problems.
Zonealarm Extreme Security

This is the one that has no problems at all
Microsoft Security Essentials and Windows Firewall.

So what security software have you used that's caused problems and what do you use that is issue free.