As we all know, in order to prevent worm spread and attacks, Windows XP SP2 will limit 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 mistakes 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 operation steps are as follows: Click "Start" /Run, enter Regedit to open the registration Table, navigate to HKEY_LOCAL_MacHINE\\SYSTEM\\Curr entControlSet\\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 in fact can not break through the number of concurrent connections, 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 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. Can be replaced in DOS mode, it is recommended that you use the following special tools to replace the "Tcpip.sys" file, the steps are as follows: From the Internet http://www.lvllord.de/download.PHP?url=en /EvID4226Patch211a-en. Zip download replacement tool (only 30KB), use it to modify the system file Tcpip.sys maximum security concurrent connection limit; then back up the C:\\Windows\\system32\\drivers\\Tcpip.sys file. Next, double-click to open the download file ZIP Compress the package, run the replacement tool EvID4226Patch.exe, and a command line prompt window will pop up, first display the current version of Windows Tcpip.sys file, and the limit value of the concurrent connection (default is 10); then ask if you Limit the number of connections to 50 (see Figure 1 below). You can select "Yes/No/Change" if you enter "Y" , the number of concurrent connections will be changed to "50", if you want to change to other numbers (for example, 150), you can enter "c" at the prompt, then enter the maximum number of concurrent connections (for example, 150), and finally Enter "Y" at the prompt and press Enter. This will 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 "Yes". " button, after restarting, the replacement of Tcpip.sys file is done! Now your maximum number of concurrent connections has exceeded 10, reaching 150, so the multi-threaded access speed of Windows XP SP2 has been improved when you use FlashGet, BT, etc. When downloading multiple threads, you will not feel the limitation of network bandwidth. Third, modify Tcpip.sys file under DOS
The above replacement program EvID4226Patch.exe can also be used under DOS by: first EvID4226Patch Copy .exe to the root directory of the C drive; then enter DOS mode, enter the root directory of the C drive, enter the command EvID4226Patch/L=$n$/w=C:\\Windows\\system32\\drive Rs/L=tcpip.sys can modify the Tcpip.sys file. 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 tool that comes 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 the official version of BitSpirit V2.7.2.225 Simplified Chinese from http://download.pchome.Net/php/dl.PHP?sid=15504, and then double-click the downloaded file to install it. You can choose which components to install (Figure 2 below). The "TCP/IP connection cracking patch for Windows XP SP2" should be installed. After the installation, the BitSpirit program group will be available in the XP start menu. Click "XP SP2 connection number crack patch" to modify 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 (Figure 3 on the right). You can enter a number in "TCP/IP Linitation" to set the maximum number of concurrent connections, for example, enter 150, and 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 enabled, which will accelerate the spread of viruses and Trojans. Therefore, while pursuing the speed of network downloading, you should also pay attention to network security. 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.