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Thread: Windows Vista tcpip.sys Connection Limit Patch for Event ID 4226

  1. #1
    Join Date
    Aug 2005
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    257

    smile Windows Vista tcpip.sys Connection Limit Patch for Event ID 4226

    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 TCPIP.SYS Patch for 10 Connection Limit, 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

    Unless Windows XP SP2 which has 10 maximum incomplete 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, 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 crack the TCP connection limit in Vista is not as easy as in Windows XP. To remove maximum half-open connection limits in Windows Vista, apply the patched tcpip.sys with the following steps:

    1. Download patched tcpip.sys: 64-bit tcpip.sys or 32-bit tcpip.sys.

    2. Open command prompt, and run the following 2 commands:
    Code:
    a. takeown /f c:\windows\system32\drivers\tcpip.sys
    b. cacls c:\windows\system32\drivers\tcpip.sys /G “username”:F
    Replace username with the actual user name that used to log on to Windows Vista currently.

    3. Disable the TCP/IP Auto-Tuning feature by running the following command in command prompt:

    Code:
    netsh int tcp set global autotuninglevel=disable
    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:

    Code:
    bcdedit.exe -set loadoptions DDISABLE_INTEGRITY_CHECKS
    5. Replace the tcpip.sys in C:\windows\system32\drivers 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:

    Code:
    HKEY_LOCALL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    7. Right click on the right pane, select “New”, then select “DWORD value”. Enter the new value name as “TcpNumConnections” (without quotes).

    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 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.

    The TCP connection limit which trigger Event ID 4226 has now increased to 500 (or any other value you set).

  2. #2
    Join Date
    Aug 2005
    Posts
    257

    ThumbsUp

    Check the following files attached:

    32 bit tcpip.zip for 32 bit System
    62 bit tcpip.zip for 64 bit Systems
    Vista_TCPIP_limit_16777214.zip registry file

    Please note you need to be a registered member @ TechArena to download this files, to become a registered member please click this link:
    http://forums.techarena.in/register.php
    Attached Files Attached Files

  3. #3
    Join Date
    Apr 2007
    Posts
    1
    Hi Mate i tired following the steps and somehow doesn't work (i'm a newbbie at this)

    when i input:
    c:\users\alien>takeown /f c:\windows\system32\drivers\tcpip.sys
    i get:
    ERROR: The current logged on user does not have ownership privliges on the file <or folder> "c:\windows\system32\drivers\tcpip.sys" <== note: but i'm the only user on my computer

    then when i type in:
    c:\users\alien>cacls c:\windows\system32\drivers\tcpip.sys /g "alien"
    I get: Invalid arguments
    NOTE: Cacls is now deprecated, please use icacls.

    Displays or modifies access control lists etc..................

    Then when i input:
    netsh int tcp set global autotuninglevel=disable
    I get:
    Set global command failed on ipv4 the request operation requiers elevation


    Could you give me step by step on what do i have to you input
    please

    my c: start in command prompt like this C:\Users\Alien>

  4. #4
    Join Date
    Nov 2007
    Posts
    1
    please help stuck on replacing .sys file rubbish vista won't let me do it needs permission tried in safe mode and everything but still won't have it really need this to work xp was so much easier vista has taken the fun ou of home computers

  5. #5
    Join Date
    Oct 2007
    Posts
    6
    Hi aliisic

    The first thing I see that you did wrong, you wrapped your "username" (alien) with the quote tags -c:\users\alien>cacls c:\windows\system32\drivers\tcpip.sys /g "alien"

    Thats the Invalid Argument, just remove the quote tags for that command to work.

    Second, it would seem that even tho you're the only user on your Vista machine, and that user account is "usually" an Admin account by default, it would seem to me that you're not actually running with administrative rights...maybe. Try this...instead of opening a command prompt window in your usual way, click the Start orb, type cmd in the search box, right click on cmd.exe and select "Run as Administrator".
    This will open command under administrator rights and maybe solve your issue concerning ownership of the file in question.

    Dave

  6. #6
    Join Date
    Oct 2007
    Posts
    2
    hi i'm a newbie at this too

    i've downloaded the 32bit patch. do i then just go into command prompt and follow the instructions? do i need to replace the tcpip.sys file with the patched one?

    Any help greatly appreciated

    Thanks

  7. #7
    Join Date
    Oct 2007
    Posts
    6
    Hi tophisu

    Yes, just access the command prompt window with Administrator rights (as I described above) and enter the commands needed.
    You do need to replace the current tcpip.sys file with the new one you've d'loaded, make sure to use the correct version (32 - 64 bit). You can't do this without running the first commands because it's a protected file and most times it's also best to do this in Safe Mode but it "should" work in a normal boot mode too.

    After the file has been replaced you need to access and modify the Registry. If you've worked in there before it's not hard at all to do this, but if you've never modified the registry before it's best to ask for help before doing so.

    Dave

  8. #8
    Join Date
    Oct 2007
    Posts
    2
    Thanks for that

    to be a pain once more

    i got two tcpip.sys files, which one do i replace,

    ones in system32 folder, the others x86_microsoftwindows-tcpip (C:\windows\winsxs)

    Cheers

  9. #9
    Join Date
    Oct 2007
    Posts
    1

    32 or 64?

    Hi,
    I'm a newbie here.
    Just trying to fix d problem with the download limit.
    How do I know if I need a 32 or 64 bit patch?
    Thanks

  10. #10
    Join Date
    Oct 2007
    Posts
    1
    Quote Originally Posted by angelmonki View Post
    Hi,
    I'm a newbie here.
    Just trying to fix d problem with the download limit.
    How do I know if I need a 32 or 64 bit patch?
    Thanks
    Start Menu
    Control Panel
    System and Maintenance
    "Find which system of Windows you are using" (under the "Welcome Center" option)
    Show More Details

    That should show you a page with all of your PC's info, and under "system" it should show you if it's the 32 or 64-bit version.

    Quote Originally Posted by angelmonki View Post
    I have already downloaded the 32 bit patch n did the 1st few steps.
    How do you replace the original tcpip.sys with the downloaded one?
    Thanks heaps.
    Take the DLed one and copy it to the where the original is, then windows should say the file already exists, and ask if you wanna replace it with the new one or cancel (something to that effect). Just replace it.

  11. #11
    Join Date
    Dec 2007
    Posts
    1

    BSOD after reboot

    Hello, i did all the mentioned things and after reboot I got blue screen of the dead and nothing helped, only to restore original tcpip.sys.

    to problems with icacls / cacls - if problem acceptinng account name - use "Administrators" without "" it helped me...

    is there any newer version of tcpis.sys or what might be wrong?

  12. #12
    Join Date
    Oct 2007
    Posts
    6
    Well, I have some news also.

    When I was using Vista 32bit, the TCP/IP limit patch worked perfectly, but when I tried it with my 64bit Vista, it also hosed my Network Connection!
    The bad thing is, that just after I clicked "Copy and Replace" for the tcpip.sys file, I realized that I had not copied the original file in case it failed.....doh!!
    And it Did fail!!
    I had no way of replacing the overwritten original file and no way to go online to find another.
    I have no idea why System File Checker (SFC) doesn't work like it did in XP, and replace any overwritten system files...in Vista it just scans and then throws an error when it reaches 98%. The log shows that the tcpip.sys file is the cause but it offers no way to replace the file so I just reinstalled to get it over with.

    I think it's VERY OBVIOUS by now that the 64bit TCP/IP limit patch is flawed and SHOULD NOT BE USED!!!
    Too many 64bit users are having serious issues with this patch and I suggest that the author have a good look at the stack after the patch is applied, because it's becoming corrupted, and test it better before release.

    Again for 64bit Vista users, DO NOT APPLY THE PATCH, until it's been repaired and reposted!

  13. #13
    Join Date
    Jan 2008
    Posts
    1
    hey guys this patch aint that important after days of messing around with utorrent on this **** vista os I finally worked out how to get utorrent going reasonably first things first download the 1.7.5. version then go on youtube and follow the instructions for making utorrent faster to the dot and then this is the important part and its so simple you won't really notice the difference untill it is done but the speed test is more important than you think you can check that out on one of he tuitions on youtube too. after I had set it accordingly I am now from .2 kb's per second for one download to a max in the last half hour of wow 186 split between two downloads and still rising I can't believe how much of a difference it has made and the port I used is'nt even forwarded from my router and I could'n get the patch to work and so gave up I know this ain't as fast as alot of other people but through my wireless connection of bout 700kb's on the speed test it ain't bad, anyway le me know how you get on

  14. #14
    Join Date
    Jan 2008
    Posts
    1
    The Vista x64 tcpip.sys provided here does and always has worked just fine. The only problem is that in Vista x64 all kernel mode drivers that do not have a valid driver signature are blocked UNLESS you disable driver signature enforcement. This is done by pressing F8 just before booting up Vista x64 and then selecting "Disable Driver Signature Enforcement". You need to do this each and every time you start up windows or the modified tcpip.sys will not be allowed to load since its signature is invalid. The only way to currently always automagically disable driver signature enforcement is to follow the following link: hxxp://thebackroomtech.wordpress.com/2007/11/05/howto-disabling-driver-signing-in-windows-vista-64-bit/ ... and read the post from E-M@iLinAtoR @ December 16, 2007 at 5:33 pm. It basically boots from a floppy or USB key and presses F8, Up, Up, Enter automatically whenever you start up your computer. It works really well, and there appears to be another way to get this going without a floppy/usb key but instructions on how to do so haven't yet been released.

  15. #15
    Join Date
    May 2008
    Posts
    1
    i did this step by step no errors but no download more my download is the same

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