Microsoft has released a knowledge base article in which the Redmond based company admits that their integrated firewall solution, which customers have inadvertently been encouraged to use, lacks the ability to block suspicious data traffic using Internet Protocol version 6 (IPv6). This is a small but embarrasing statement by Microsoft, which has been working on IPv6 since 1998. Not only Windows XP is affected by the issue but the recently released Windows Server 2003 versions are as well. IP version 6 (IPv6) is a new version of the Internet Protocol, designed as the successor to IP version 4 (IPv4) which allows expanded addressing capabilities, header format simplification and improved support for extensions and options among a variety of other new features.