When you open a HTTP connection, except through a proxy server, the connection remains open until it has been idle for one minute, or until the KeepAliveTimeout value has expired. Once reset, any new request opens a new TCP/IP socket.
You can alter the default 60000 milliseconds:
1. Close all instances of Internet Explorer.
2. Use the Registry Editor to navigate to:
3. Add the KeepAliveTimeout Value Name, a REG_DWORD data type, and set the data value to a decimal number between 60000 milliseconds (1 minute) and 2147483647 milliseconds (~24.85 days).