Starting with Windows XP SP2 (and Windows Server 2003 SP1 beta as well), Microsoft throttles the concurrent outbound half-open TCP connections per second -- apparently in the name of security. Pre-Windows XP SP2 systems allowed basically unlimited simultaneous outbound TCP connections, but with this new "enhancement," only 10 of those connections per second are allowed. This may be suitable for regular Windows users, but it hampers us security folks who use programs that open multiple TCP connections simultaneously, such as port scanners and vulnerability assessment tools.
Hack to speed up security scans
Step 1: Understanding the limitation
Step 2: Making the changes
Step 3: Be forewarned
|ABOUT THE AUTHOR:|
| Kevin Beaver is an independent information security consultant, author and speaker with Atlanta-based Principle Logic LLC. He has more than 17 years of experience in IT and specializes in performing information security assessments. Beaver has written five books, including Hacking For Dummies (John Wiley & Sons, Inc.), the brand new Hacking Wireless Networks For Dummies and The Practical Guide to HIPAA Privacy and Security Compliance (Auerbach Publications). He can be reached at firstname.lastname@example.org.
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