TCP-Z 2.6.2.75 is a IP Utility product from deepxw.blogspot.com, get 5 Stars SoftSea Rating, TCP-Z is the best TCP Half Open Limited Patcher and Monitor. The software was designed to be an TCP half open limited patcher and monitor.

Features:
- Modifies Tcpip.sys in memory. The changes take effect immediately; do not need to restart the computer.
- It searches limited offset through signature, with a wide compatibility, no longer focused on the MS upgrade and update.
- Support all version of Windows XP SP2/SP3, include 32bit & 64bit; Support all version of Windows Vista & SP1, include 32bit & 64bit; Support Windows 7 M3.
- Supports Vista x64. But my driver has not a valid Signing, so you must enable TESTSIGNING mode.

I say that TCP-Z is good because there is an option to modify the limited of half-open (incomplete outbound) TCP connection by patching the memory. If you want to start P2P download via BitTorrent, just run TCP-Z, increase the half-open TCP connection and start downloading. When you shutdown the computer and restart the next time, the previously increased TCP connections will be reset to default which is 10. The memory patching takes effect immediately without rebooting the computer and doesn't modify any system files.

Other than that, TCP-Z shows number of established connections, half open connections, Create depth, download/upload speed in real-time. It will also show the number of warnings events in per-minute, which TCP half open connection overload.

There are two methods to use TCP-Z. First is to manually run TCPZ.exe and go to Patch tab and change the settings there. Another way is to install TCP half open limited patcher in virtual device mode. Go to VirtualDevice folder inside TCPZ and run TCPZ_Setup-x86.exe if you're running Windows 32bit or TCPZ_Setup-x64.exe if running Windows 64bit. You can then change the TCP limit from Device Manager > TCPZ Driver > TCP Half Open Limited Patcher (TCP-Z).

TCP-Z works on Windows XP SP2 & SP3/2003/2008/Vista SP1 & SP2/Windows 7, all 32bit (x86) / 64bit (x64). It does what it supposed to and most importantly it is free and portable. Since this tool is capable of patching memory and system file TCPIP.SYS, your firewall or antivirus might find that this tool as a threat. Rest assured that it is definitely safe from virus if you downloaded it from the official TCP-Z website. Since I can't get full download speed from RapidShare, I am back to using BitTorrent and TCP-Z is really a gem!

History, when Windows XP Service Pack 2 was released, it came together with a new feature to TCP/IP in order to babysit users and "reduce the threat" of worms spreading fast without control. In one such attempt, the devs have limited the number of possible TCP connection attempts per second to 10 (from unlimited in SP1). This argumentative feature can possibly affect server and P2P programs that need to open many outbound connections at the same time

For this driver can run in Vista x64, you have to do:
Open command prompt as administrator, run this command:
* bcdedit.exe -set loadoptions DDISABLE_INTEGRITY_CHECKS
* bcdedit.exe -set TESTSIGNING ON

* Restart the computer to take effect.
* Only need to run this script once, the system will always remember this setting.

* TCP-Z shows number of estabilished connection, half open connection, Create depth, download/upload speed in real-time.
* And program will show the number of warnings events in per-minute, which TCP half open connection overload.

Please Note: you need use 7-zip to open the download file.
SoftSea.com had fully tested, reviewed and uploaded the install files, TCP-Z does not contain any adware or spyware, the latest version is 2.6.2.75, you can download this ip utility software (649 KB) from special server of SoftSea.com. The license of this networking software is Freeware, you can free download and free use this Networking software.