By default what’s the maximum number of TCP Connection ?
With the release of Microsoft Windows XP Service Pack 2 (SP2), it has limit the concurrent TCP connection to 10 connection per seconds.
With Service Pack 1 or without any service pack installed, your computer has no limit on the number of concurrent TCP connection.
Why Microsoft Windows Service Pack 2 (SP2) want to limit the number of TCP connection?
This is to reduce the speed of computer virus or worms spreading across the network.
How it affect the BT download speed?
BT tend to open a lot of outbound TCP connection at one time to download from different sources. With only 10 connection per second, it might reduce the BT download speed.
How do i know if my computer has reach the maximum TCP connection?
To know if youâ€™re hitting concurrent TCP connection attempts limit, Go to Control Panel -> Administrative Tools -> Event Viewer -> System, look for TCP/IP warning “TCP/IP has reached the security limit imposed on the number of concurrent TCP connect attempts”. It has the Event ID of 4226
How to adjust my Window XP TCP Connection to boost my BT download speed?
Just change the 10 tcp connection limit to 10,000. To change the limit on TCP connection in Windows XP SP2, you can use the following program that works on every language of Windows XP:-
You might want to back up the tcpip.sys, although the program has the ability to restore tcpip.sys to original state.
Once you change your TCP Connection number, restart the PC and now your BT download speed will be more better 🙂