Update of TCPIP.SYS
Microsoft released a new TCPIP.SYS with build 5.1.2600.2892 on the yesterday's patch-day. 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.
LvlLord

v2.23d  -  2005-05-01
?Bug: Wrong position position to patch in final SP1 for Server 2003 32bit's TCPIP.SYS detected
?Feature: Advanced detection of wrong position

v2.23c  -  2005-04-25
?Bug: On a few systems the patched TCPIP.SYS was not installed (should be fixed)

v2.23b  -  2005-04-21
?Bug: Bug in processing the SfcDLLCacheDir registrykey

v2.23   -  2005-04-21
?Feature: Now also on 64-bit systems (till SP1) the TCPIP.SYS can be accessed (thx to Pyr0!)

v2.22   -  2005-04-20
?Bug: Renaming did not work ...
?ToDo: Detection of original XP 64 TCPIP.SYS won't work during restriction of 32bit programs.
        Will be fixed when time comes.

v2.21   -  2005-04-20
?Feature: AMD64 files are supported
?Feature: Itanium 64 file detection (but cannot be patched yet, due to missing files for testing)
?Feature: Installation of TCPIP.SYS improved (recheck after patching if it's still the right version)
?Feature: Automatic renaming of files, which might disable successful patching
?Bug: Wrong shown versionnumer in program (2.11a instead of 2.12, now 2.21 of course ;-)
?ToDo: Detection of original XP 64 TCPIP.SYS won't work on all system

v2.12   -  2004-09-22
?Feature: It's now possible to copy back the safety-copy
?Bug: Wrong versioninformations shown on Windows XP prior to SP2
 (There is no repatching needed on already patched TCPIP.SYS's)

v2.11a  -  2004-08-31
?Feature: It's now possible to change the limit during runtime
 (There is no repatching needed on already patched TCPIP.SYS's)

v2.10a  -  2004-08-20
?Feature: Support added for Windows 2003 SP1 beta
?Feature: If no limit is given with the parameter /L, it will be asked for during runtime
?General: Big codechange
 (There is no repatching needed on already patched TCPIP.SYS's)

v2.0c2 (Forum)
?Bug: Added checkk, if WFP restored in the short time the original version
?Feature: Errormessage on read-only WFP-safetycopies added
 (There is no repatching needed on already patched TCPIP.SYS's)

v2.0c
?Bug: A limit has been found, altough no limit exists
?General: Small codechanges
 (There is no repatching needed on already patched TCPIP.SYS's)

v2.0b
?Added parameter /F to patch a specific file instead of whole Windows
 (There is no repatching needed on already patched TCPIP.SYS's)

v2.0a
?General: Completely rewritten program
?Feature: Automatic detection of Windowsdirectory
?Feature: Automatic patching of files in Windows-directory (no more manual copy needed)
?Feature: Added parameter /W to force a Windowsdirectory
?Feature: Added parameter /L to manually set a limit (10-16777214)
?Feature: Automatic detection of the limits on known and unknown build's possible
 (There is no repatching needed on already patched TCPIP.SYS's)

v1.0
?General: First published version
?Feature: Set the limit to 50 of the TCPIP.SYS in current directory. Manual copy needed

XP sp2 TCP补丁（evid4226patch223d）使用教程

关于 sp2 TCPIP并发连接数限制的常识性知识请参考相关内容 虽然Bitcomet 0.55以后的版本可以通过设置选项里的“最大同时尝试TCP连接数”以适应SP2并发连接数10的限制，但是如果出现下载速度很慢，断网等异常现象的话，仍然建议安装第三方补丁（尤其是内网用户）。 部分ADSL用户由于设备能力限制，并发连接数过高反而会造成断流等现象，请根据自身实际情况选择。 ps. 微软的月度安全更新有可能重置TCPIP.sys文件（例如05年4月和6月的更新），因此sp2更新后BC下载有异常现象的话，请检查 控制面板-管理工具-事件查看器-系统 是否有来源为tcpip的ID为4226的警告：“TCP/IP 已经达到并发 TCP 连接尝试次数的安全限制。”…… 补丁使用方法 1、运行EvID4226Patch.exe文件，出现图示窗口。 y=默认修改为50 n=保留原始设定 c=修改为其他数值 u=卸载补丁 如需修改为50以上，则按键盘C键，然后输入希望数值（图示为500），回车。 2、程序再次询问是否希望修改为500。当然是Y 3、补丁应用过程中会出现如图提示，选取消。 看清楚是取消！！

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