1. Windows XP SP3 TCP/IP Patch To Increase Maximum Half Open Connection Limit Depends. If you are making more then 10 connections at a time this should theortically increase. VirusTotal Scan. It doesn't seem to work with Windows Server 2003 Datacenter Edition. Your an idiot. Of course it.
2. Tags: tweak, XP, TCP/IP, tcpip.sys, patch In addition to the tweaks already covered in Win 2k/XP Registry Tweaks and More Win 2k/XP Tweaks, the Windows XP Service Pack 2 introduces a few new issues covered in the article below.

1. Tcpip.sys Windows 10
2. Windows Xp Tcp Ip Sys Patch Windows 10
3. Tcpip.sys Bsod
4. Tcpip Sys Blue Screen Windows 10

Apparently in Windows Vista, Microsoft still enforce and hard-limit (hard coded in tcpip.sys) the maximum simultaneous half-open (incomplete) outbound TCP connection attempts per second that the system can make, as in Windows XP SP2, in order to protect the system from being used by malicious programs, such as viruses and worms, to spread to uninfected computers, or to launch distributed denial of service attack (DDoS). When the limit is hit, in Event Viewer, there will be such an entry:

EventID 4226: TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts

Windows XP SP2 tcpip.sys connection limit patch. With the new implementation, if a P2P or some other network program attempts to connect to 100 sites at once, it would only be able to connect to 10 per second, so it would take it 10 seconds to reach all 100. In addition, even though the setting was registry editable in XP SP1.

Unlike Windows XP SP2 which has 10 maximum incomplete concurrent connection attempts limit per second, Windows Vista default limit is based on which edition of Vista users are using. For example, Home Basic has maximum limit of 2, and Vista Ultimate is 25 per second. Normal Windows Vista users should not face any problem or slow network connection with the half-open connections limit. However, heavy P2P (peer-to-peer) applications users such as uTorrent, BitTorrent, BitComet, Azureus, ABC, eMule (eDonkey network), etc, or P2PTV such as TVants, PPLive, PPStream, Sopcast, etc may face some error or slow download and upload speed due to this limit.

Due to enhanced security, to fix or crack the TCP concurrent connection limit in Vista is not as easy as in Windows XP. To remove maximum concurrent half-open connection limits in Windows Vista, apply the patched tcpip.sys with the following steps:

1. Download patched tcpip.sys: Vista TCP/IP and UAC Auto Patcher (patched tcpip.sys is contained inside the archive).
2. Open command prompt, and run the following 2 commands:

   Usb locker serial number and registration key. Replace username with the actual user name that used to log on to Windows Vista currently.

   The second command can also replace with the improved icacls:

3. Disable the TCP/IP Auto-Tuning feature by running the following command in command prompt:
4. For 64-bit Windows Vista (x64), the integrity checks need to be disabled as it need all drivers to be signed. So run the following command in DOS prompt:

   Note: Above command no longer supported, and users require to press F8 on system startup to bypass driver signing integrity check.

5. Replace the tcpip.sys in C:windowssystem32drivers folder with the patched tcpip.sys downloaded from step 1 (remember the use the correct x64 or x86 version）. Normally, this procedure can be done by simply login to Windows Vista with administrator account. However, if the process failed, reboot the computer and then press F8 to boot up in Safe Mode, and then copy and paste overwrite the tcpip.sys.
6. Next, the maximum number of TCP half complete connection limits need to be set in registry. Open registry editor (regedit), and navigate to the following registry key:

   HKEY_LOCALL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters

7. Right click on the right pane, select “New”, then select “DWORD value”. Enter the new value name as TcpNumConnections.
8. Double click on TcpNumConnections registry value, and modify the value data to the desired maximum TCP/IP connection limit that you want to allow, in decimal value. For example, enter 500 as the value data for TcpNumConnections. You can use any limit that you prefer.

   Alternatively, download this registry registration file (no longer available) that when executed, will set the TCP simultaneous connection limit to 16777214 (you can always modify the value in the file or in the registry after applied).

9. Restart computer.

Update 5 (Latest): Since Windows Vista and Windows Server 2008 SP2, there is no more restriction (now unlimited) concurrent half open TCP/IP connection limit.

Update 4: Windows Vista Event ID 4226 Auto Patcher

Windows Vista Event ID 4226 Auto Patcher has been renamed as Vista tcpip.sys and UAC Auto Patcher, which now has more than 6 versions of auto patcher download links for different versions of tcpip.sys with the release of various hotfixes and SP1. Visit the page for details.

Update 3: Half-Open Limit Fix (Automated tcpip.sys Patch using Test Self-Signed Certificate)

Update 2: Driver Version: CrackTcpip.sys for Vista SP1 v.668 – a non-patching method to bypass TCP connection limit.

Update 1: Also available is TCP/IP auto patcher for 64-bit (x64) Windows Vista SP1.

Gui Version: VistaTcpPath TCP Auto Patcher which works for Vista RTM (non-SP1) version of tcpip.sys.

Old Version:

Tcpip.sys Windows 10

Version 1.0
Version 1.2
Version 1.3
Version 1.4
Version 1.5
(resources no longer available)

With thanks to YaronMaor for batch script.

The TCP connection limit which trigger Event ID 4226 has now increased to 500 (or any other value you set), and will likely fix the error for re-occurring again.

The Microsoft Windows operating system has always been well known to be easily infected by computer viruses. This is why there are so many viruses that can infect a Windows machine, but very little in other operating systems such as Linux and Mac OS. Since viruses can spread quickly through the network, one of the efforts made by the Microsoft team in Windows XP is the half-open TCP connection limitation to slow the propagation of malware from the infected machine.

This feature was implemented in Windows XP Service Pack 2 but has been disabled since Windows Vista Service Pack 2. This would also mean that any Windows operating system later than Vista SP2 such as 7, 8 and even 10 will not have this half-open TCP connection limitation anymore.

The default number of maximum half-open connection is 10 and most people who download files using BitTorrent would normally want to increase it to 50. However most people don’t know that increasing the number of half-open connections does not increase the download speed, but it only decreases the time to connect to the maximum number of peers. Setting this limit too high may greatly slow down your router in making new connections. If you’re looking to increase the half open-connection limit, here are 4 tools to do that.

1. EvID4226Patch

This intelligent TCPIP.SYS patcher by LvlLord was one of the first, if not the first free tool to increase the maximum concurrent half-open connections for Windows XP. It is able to detect the current limit and allows you to increase the limit to 50 by pressing the Y key. You can specify your own number by pressing the C key followed by your preferred number of connections.

The patcher will then ask you to allow renaming the backup TCPIP.SYS file so that Windows will not be able to automatically restore the modified TCPIP.SYS file. Press Y key and a 15 seconds countdown will start. If you see a Windows File Protection dialog box appear asking you to insert your Windows XP CD, just press the Cancel button followed by Yes to keep the unrecognized file version. Press any key to close the EvID4226Patch and restart your computer for the changes to take effect.

To restore back the original TCPIP.SYS file, run the EvID4226Patch again and press the U key followed by Y twice. Do take note that the password to extract the ZIP file is “abc” without the quotes.

Download EvID4226Patch

2. Universal Tcpip.sys Patch

This Universal Tcpip.sys Patch is an alternative to EvID4226Patch. They do the same thing which is intelligently patching the TCPIP.SYS file to increase the number of half open connections but has 3 advantages which are the graphical user interface, the support for Windows Vista and 64-bit version of Windows.

All you need to do is run the program, set the number of half open connections in the box, click the Apply button and reboot your computer. You can easily roll back the changes by clicking the Restore button. The status in the information box will show you if the limit has been modified or if it is still the original file.

Download Universal Tcpip.sys Patch

3. Half-Open Limit Fix

Half-Open Limit Fix is an easy to use and single portable tool to set a new limit for half open connections by patching the TCPIP.SYS file. It basically does the same thing as the first two tools mentioned above. It shows the current limit with the default recommended limit of 100. Clicking the “Add to tcpip.sys” button will instantly patch the tcppip.sys file. Reverting back the changes is as easy as clicking the “Restore original file” button.

A lot of languages are supported which can be switched by pressing the drop down menu and it works on both 32-bit and 64-bit without requiring to run a specially compiled X64 version.

Download Half-Open Limit Fix

4. TCP-Z

TCP-Z changes the half open limit using a different method which is by patching the kernel memory, rather than patching the system file. This method is very useful if you need to instantly increase or decrease the number of half open connection without the need to restart your computer because the changes take effect immediately. Obviously the modified value will be lost after restarting the computer. If you want a permanent effect, there is also an option to patch the tcpip.sys file.

Other than just a regular half open connection limit patcher, it also comes with a useful chart showing the processes with an established connection and the half open connection. This way you can accurately tell if the half open connection that you’ve set is too high or low and make changes accordingly without guessing.

Do take note that it is necessary to restart the download from the download program after you’ve set a new limit in the memory to take effect.

Download TCP-Z

Additional Notes: When Windows XP was still receiving updates, it is well known to reset back the half open connection limit from time to time when the TCPIP.SYS file got updated. Since Windows XP is no longer being supported today, there will be no more security updates provided to home users and this will mean that the file patching method will be permanent.

Even though these half-open connection limit patcher tools are no longer being updated, they still work perfectly on Windows XP and Vista. According to StatCounter Global Stats for April 2015, Windows XP is the second most used Windows operating system at 13.78% and it translates to more than 200 million users!

Here is an easy way to see if you need to increase the half-open connection limit. Go to Control Panel > Administrative Tools > Event Viewer. Click on System and search for a warning type with number 4226 at the Event column. Double clicking on the item will open the properties window for the event.

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If you do not see any 4226 event, then you do not need to increase the half-open connection limit.

You might also like:

Stop BitTorrent from Killing Your Internet Connection4 Apps to Route All Internet Connection Through Open Proxy Servers3 Free Tools to Restrict or Limit Internet Download and Upload Transfer Speeds2 Tools to Decrease Download and Increase Upload Ratio in BitTorrent Trackers4 Ways to Automatically Disable Wireless Network Connection when Local Area Connection is Enabled

really good ones !!!

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Works great, and with Vista and Windows 7 beta. I use the virtual driver and set the value to “0”, which is only supported by the two latter systems. Highest value I’ve found using it manually is 252.

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Windows Xp Tcp Ip Sys Patch Windows 10

Wow… finally a patch for vista!

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Thank You Sir, it helps :)

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I love the option where you can open your connections without rebooting.

I tested in vista and xp and its the best patch ever!!

thanks alot.

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How nice I like that GUI.

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Thanks, It was Great…

Tcpip.sys Bsod

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Thanks!

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Thank you very much for this valuable information Ray.

However, as already posted, my current value is 252 so what would be your opinion on what value my linternet would best operate ?

Thanks again.

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Excellent find Raymond. Thanks. It seems to do more as advertised. It does wonders for the speed of my connection. Pages seem to open about twice as fast.

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Thanks Raymond, excellent tool. For while Evils tool does the job it is a pain having to redo it whenever MS patches the OS.

The Universalthemepatcher on his site is also an useful tool for those who need to patch uxtheme.dll on XP or the three relevant DLLs on vista to run third party themes of their choice.

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Thank you!

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Thanks man….!!

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raymond you are superb!!
thanks for this knowledge

Tcpip Sys Blue Screen Windows 10

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Thnks for tips

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great stuff again from the great creator of this blog!

thanks ray! :)

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nice find sir raymond

thank you…

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thnxxxx Raymond

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Thanks. Great find.

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