Update Of TCPIP.SYS
Microsoft released a new TCPIP.SYS with build 5.1.2600.2892. The current Patcher 2.23d is still capable of changing the half-open tcp limit. But you need to reapply the patcher to set a higher limit to the new version.
Download: http://www.lvllord.de/?lang=en&url=downloads#4226patch
F.A.Q: http://www.lvllord.de/?lang=en&url=4226patch/faq
