Download Vista tcpip.sys and UAC Auto Patcher to Increase TCP Connection Limit

Windows Vista TCP/IP (tcpip.sys) and UAC Auto Patcher is a simple batch command script that automatically replaces and overwrites original tcpip.sys in \Windows\System32\Drivers\ folder with a patched tcpip.sys version (included) that has been modified and cracked to unlock and remove the limit imposed on concurrent half open TCP/IP connection attempts that Vista can launch at any one time. Patching the tcpip.sys to remove the restriction potentially yields benefits or solves problems as below.

• Event ID 4226 in Event Viewer that describes TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts (more info).
• Slow browsing speed such as web page unable to load or refresh when using P2P applications such as BitTorrent (BT) clients and eD2K eMule client.
• Improve torrent speed and fix slow or even not moving downloading and uploading speed when using P2P programs. (see how to optimize torrent speed in Vista)

Prerequisite to Use Vista tcpip.sys and UAC Auto Patcher

Microsoft has released plenty of versions of tcpip.sys, thus each different versions of Windows Vista TCP/IP and UAC Auto Patcher will work only on certain version of Windows Vista, depending on the variant of tcpip.sys installed. To check the version of tcpip.sys, navigate to \Windows\System32\drivers folder, right click on tcpip.sys and select “Properties”, and the version info will be listed in “Details” pane.

Features of Vista tcpip.sys and UAC Auto Patcher

• Automatically copy and replace tcpip.sys with patched version that unlock TCP/IP connection limit.
• Set the maximum concurrent half-open TCP connection attempts to 50,000.
• Disable User Account Control (UAC).
• Disable Vista TCP Auto Tuning feature to minimize possible networking problems.

Download Vista tcpip.sys and UAC Auto Patcher

Vista tcpip.sys and UAC Auto Patcher v1.6: VistaTcpipUacPatch1.6.rar (mirror)
For Vista RTM with tcpip.sys version 6.0.6000.16386. (Support x86/32-bit and x64/64-bit editions)

Vista tcpip.sys and UAC Auto Patcher v1.9: VistaTcpipUacPatch1.9.rar (mirror)
For Vista RTM with tcpip.sys version 6.0.6000.16567, applicable after installing KB941644. (Support x86/32-bit and x64/64-bit editions).

Vista tcpip.sys and UAC Auto Patcher v1.9b: VistaTcpipUacPatch1.9b.rar (mirror)
For Vista RTM with tcpip.sys version 6.0.6000.20689, applicable after installing KB941644. (Support x86/32-bit and x64/64-bit editions).

Vista tcpip.sys and UAC Auto Patcher v1.9c: VistaTcpipUacPatch1.9c.rar (mirror)
For Vista RTM with tcpip.sys version 6.0.6000.16627, applicable after installing KB946456. (Support x86 or 32-bit edition only)

Vista tcpip.sys and UAC Auto Patcher v1.9d: VistaTcpipUacPatch1.9d.rar (mirror)
For Vista RTM with tcpip.sys version 6.0.6000.20752, applicable after installing KB946456. (Support x86 or 32-bit edition only)

Vista tcpip.sys and UAC Auto Patcher v2.0: VistaTcpipUacPatch2.0.rar (mirror)
For Vista SP1 with tcpip.sys version 6.0.60001.18000 (Support x86 or 32-bit edition only)

User has problem applying or EventID 4226 still appearing can try to use Windows Vista SP1 64-bit (x64) tcpip.sys version 6001.18000 Auto Patcher.

Vista tcpip.sys and UAC Auto Patcher v2.1a: VistaTcpipUacPatch2.1a.rar (mirror or mirror 2)
For Vista SP1 with tcpip.sys version 6.0.60001.18000 (Support both x64 and x86 Windows Vista SP1 - run InstallPatch32.bat or InstallPatch64.bat accordingly.)

Vista tcpip.sys and UAC Auto Patcher v2.2: VistaTcpipUacPatch2.2.rar (mirror 1 or mirror 2)
For Windows Vista SP1 with tcpip.sys version 6.0.60001.18063 or 6.0.6001.22167 (Support both x64 and x86 Windows Vista SP1 - check the version of system tcpip.sys located in \Windows\System32\drivers folder, and run Install32-18063.bat or Install32-22167.bat for 32-bit Vista or Install64-18063.bat or Install64-22167.bat accordingly.)

Vista tcpip.sys and UAC Auto Patcher v2.2a (TEST version): VistaTcpipUacPatch2.2.rar
TEST ONLY. Try only if version 2.2 doesn’t work for 64-bit. For those who trying, please post in comment if this version works. For Windows Vista SP1 with tcpip.sys version 6.0.60001.18063 or 6.0.6001.22167 (Support both x64 and x86 Windows Vista SP1 - check the version of system tcpip.sys located in \Windows\System32\drivers folder, and run Install32-18063.bat or Install32-22167.bat for 32-bit Vista or Install64-18063.bat or Install64-22167.bat accordingly.)

The auto patcher can also be downloaded from yaronmaur.net.

Usage Guide / Installation

Unpack and extract the content of the archive, and then run InstallPatch32.bat (for x86 system) or InstallPatch64.bat (for x64 system). Administrator rights elevation required.

IMPORTANT for 64-bit (x64) Windows Vista (RTM and SP1) and 32-bit (x86) Windows Vista SP1:

Windows Vista now require all kernel-mode driver or software to be signed with digital signature in 64-bit Vista, and all boot-start drivers must be embedded-sign with signature on both x86 and x64 versions of Windows Vista. Unfortunately, tcpip.sys is both kernel mode driver, and also boot start driver, and modify tcpip.sys will break the existing signature, making the patched tcpip.sys unsigned.

So when using patched tcpip.sys, users must press F8 at every Windows boot load. When come to Vista Advanced Boot Options menu, select “Disable Driver Signature Enforcement” to bypass driver signing check and continue loading Windows Vista, else there may be boot-failure. The process can be automated with ReadyDriverPlus.

Uninstallation

Run UndoPatch.bat to restore original tcpip.sys (provided you don’t delete the backup tcpip.sys.original), uninstall and remove concurrent half-open TCP/IP connection limit setting in the registry, revert TCP/IP autotuning level to normal, and re-enable UAC.

FAQ and Troubleshooting

1. How to change the connection limit to other value?

   Users can change the limit to any value by navigating to the following registry key using Registry Editor:

   [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\]

   Locate “TcpNumConnections” registry value and change its value data to number you want.

2. I don’t want to disable UAC, how to re-enable UAC?

   Run “Enable_UAC_Prompt.reg”, if you no longer want to patch tcpip.sys, run “UndoPatch.bat”. It’s also possible to use tool such as TweakUAC.

3. After installing patched tcpip.sys, the following problem exists on system boots up whenever restarts:
   

   Windows Failed to Start. a recent hardware or software change might be the cause. To fix the problem:
   1. Insert your Windows installation CD & restart.
   2. Choose Language.
   3. Click “Repair…”

   File: \Windows\System32\drivers\tcpip.sys
   Status: 0xc0000428
   Info: Windows cannot verify the digital signature for this file.

   Long answer makes short is press “Enter”, or pressing F8 while system starts up, which will display Vista Advanced Boot Options startup menu. Then select to “Disable Driver Signature Enforcement”. See explanation above on usage instruction, and there is no workaround to this annoyance yet or use ReadyDriver Plus to permanently automate disabling of driver signature enforcement. Else, try out CrackTcpip.sys driver based limit bypass, or make use of fully automated Half-Open Limit Fix which makes used of test cert.

4. Can I manually install the patched tcpip.sys manually?

   Yes. Checkout the manual installation guide.

Flip to next page for changelog history.

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This entry was posted on Sunday, February 17th, 2008 at 5:20 pm and is filed under Windows Vista. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.