"Can't open webpage when downloading BT" Problem Solving Collection

It is well known that in order to prevent worm spread and attacks, Windows XP SP2 limits the number of concurrent threads to a maximum of 10. SP2 uses the Messages dynamic link library to monitor the number of concurrent threads per process in real time. Once it finds that a process has more than 10 threads, it will block some threads. SP2 does this, although it can protect against the worm of the shock wave type and strengthen the system security, but it also has some negative effects. For example, when you use BT, P2P or FlashGet software to download, some threads will be blocked, so the download speed will be It becomes very slow. To this end, you can take the following countermeasures to break through the number of TCP concurrent connections, thereby increasing the multi-threaded access speed of SP2.

First, the wrong way of the registry modification method

In order to break through the limitations of SP2 on the number of TCP concurrent connections, the Internet has circulated a way to modify the registry, the steps are as follows:

Click "Start" /Run, enter Regedit to open the registry, navigate to HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet
\\Services\\Tcpip\\Parameters, modify the key value of "TcpNumConnections", change it from 10 to 150, that is, set the maximum number of concurrent TCP connections to 150.

After the actual test, we found that the method seems to be effective, but it does not break through the number of concurrent connections and improve the multi-threaded access speed of SP2. Because SP2 controls the number of threads, it is implemented by the system file "Tcpip.sys", which is not implemented by the registry. Therefore, this method cannot increase the number of TCP concurrent connections of SP2.

Second, use tools to replace Tcpip.sys

In order to break through the SP2 TCP concurrent connection limit, the correct way is to modify the Windows XP SP2 system file Tcpip.sys. Tcpip.sys is an important system file for Windows XP SP2. It is located in the C:\\Windows\\system32\\drivers directory. This file is usually protected by the system, so you can't replace it under normal circumstances. It must be in safe mode or pure. You can replace it in DOS mode. It is recommended that you use the following special tools to replace the "Tcpip.sys" file. The steps are as follows:

Download the replacement tool from the Internet (php?url=en/EvID4226Patch211a-en.zip" Target=_blank>www.lvllord.de/download.php?url=en/EvID4226Patch211a-en.zip
), use it to modify the system file Tcpip.sys maximum security concurrent connection limit; then backup C :\\Windows\\system32\\drivers\\Tcpip.sys file.

Next, double-click to open the download file ZIP archive, run the replacement tool EvID4226Patch.exe, and then a command line prompt window will pop up, first display the current version of Windows Tcpip.sys file, and concurrent The limit value of the connection (the default is 10); then ask if you want to limit the number of connections to 50, you can choose "Yes /No /Change", if you enter "Y", the number of concurrent connections will be changed to "50" If you want to change to another number (for example, 150), you can type "c" at the prompt, then enter the maximum number of concurrent connections (for example, 150) and press Enter. Finally, type "Y" at the prompt and press Enter. Replace the Tcpip.sys file; after the Tcpip.sys file is replaced, the system file protection dialog will pop up. You can click the "Cancel" button and then click the "Yes" button to restart the Tcpip.sys file. Replace it and you're done!

Now that your maximum number of concurrent connections has exceeded 10, it has reached 150, so the multi-threaded access speed of Windows XP SP2 has been improved. When you use multi-threaded downloads such as FlashGet and BT, it does not. I feel the limits of network bandwidth.

Third, modify Tcpip under DOS. Sys file

The above replacement program EvID4226Patch.exe can also be used under DOS by first copying EvID4226Patch.exe to the root directory of the C drive; then entering DOS mode, entering the root directory of the C drive, input The Tcpip.sys file can be modified by the command EvID4226Patch/L=$n$/w=C:\\WINDOWS\\system32\\drivers/L=tcpip.sys.

Note: The above $n$ is the maximum number of secure connections you want to set. If you want to set the maximum number of concurrent connections to 150 threads, enter the command EvID4226Patch/L=150/w=C:\\WINDOWS \\system32\\drivers/L=tcpip.sys.

Fourth, use the tools provided with the bit sprite

The tool "TCP/IP connection number crack patch" that comes with the bit sprite can also replace Tcpip.sys, breaking the SP2 TCP concurrent connection limit.

Download BitSpirit and double-click the download file to install it. You can choose which components to install, you should install the "TCP/IP connection cracking patch for Windows XP SP2", after the installation, the XP Start menu will have the BitSpirit program group, click on the "XP SP2 connection number crack Patch", you can modify the Tcpip.sys file.

Click "XP SP2 Connection Number Crack" to pop up the software interface. The interface lists the current version of Tcpip.sys and the maximum number of concurrent connections. You can do this in "TCP/IP Linitation" Enter a number to set the maximum number of concurrent connections, for example, enter 150, then press the "Apply" button, after restarting the system, your SP2 maximum concurrent connections will be changed to 150.

Although the above methods improve the multi-threaded access speed of Windows XP SP2, but it reduces the security performance of SP2, if your computer is infected with viruses and Trojans, too many new threads will be accelerated. Viruses and Trojans spread, so you should pay attention to network security while pursuing network download speeds. It is recommended that you install the upgrade anti-virus software and firewall in time. If it is an ordinary user, you can use the above method to set the maximum number of concurrent TCP connections to 10 to 30, and the BT user can set it to 100 to 150.