When Windows Vista is released early next year its firewall will be set to only block incoming traffic even though it will be capable of blocking outgoing traffic. According to a statement from Microsoft, the firewall’s protection will be curbed in order to make life easier for the company’s enterprise customers.
"Because the nature of an outbound firewall is to restrict the traffic sent to specific ports, the outgoing access in the Windows Vista firewall is open by default," a Microsoft spokesperson told ZDNet Australia. "The reason for this is Microsoft has received strong feedback from its customers, especially from large organisations and government departments, saying that they would like to manage this feature from an administrator level."
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Current builds of Windows Vista do include a 2 way Firewall. But its not for the faint of heart, its actually a Microsoft Management Console Snapin, known as the Advance Security Configuration Console, that must be manually added and configured. I am not sure this will be in the final product.