PC World reports that the firewall of Windows Vista fails on outbound security.

They note that by default, outbound filtering in Winows Vista is not turned on. In order to get around this problem, the user must use the Microsoft Management Console. Then go to Windows Firewall with an applet called Advanced Security Group Policy. The user will see a command prompt where he should type in “wf.msc” without the quotation marks. Then follow more instructions which is located on PC World’s article.

The article also mentioned that it lacks a rule that prevents all malware on making outbound connections.