Saturday, January 3, 2009

Windows Half-open limit fix patch 3.1


Program Half-open limit fix intend for changing maximum number of concurrent half-open outbound TCP connections (connection attempts) in system file tcpip.sys.

This limit is entered by company Microsoft trying to make slower virus spreading from infect computer and cut down opportunities of participation of a computer in DoS attacks.

First this limit was entered in SP2 for Windows XP and present at all new versions of Windows. Limit consists that the computer is not authorized to have more than 10 concurrent half-open outbound connections. At achievement of a limit new attempts of connections are put in turn.

Thus, speed of connection to other computers is actually limited.

This limit is especially critical for P2P programs (µTorrent, BitComet, eMule, P2P TV etc.) users. When the P2P program works, pages in a browser can be loaded extremely slowly. The delay before the beginning of opening can make some tens seconds irrespective speed of your connection speed.

Half-open limit fix cleans this limit, that is increases the maximal limit of half-open connections. For the overwhelming majority of users there will be sufficient the limit equal 100.

Operating system: Windows XP SP1(x64)/SP2(x86,x64)/SP3, Server 2003 SP1(x86)/SP2(x86,x64), Server 2008(x86,x64), Vista without SP(x86,x64) and with SP1(x86,x64), 7 Beta(x86,x64)
Interface language: English and Russian.
For Vista and Server 2008 users: Maybe sometime, after updating Windows or SP installation on a desktop will appear watermarks "Test mode". They can appear because in all versions of Vista and Server 2008, except Vista without SP(x86), there is the obligatory check of the drivers signature, and the tcpip.sys file sign with test signature after patching. Most likely, to make it disappear will be necessary simply once again to patch tcpip.sys.


Changelog:
Version 3.1 (November 21, 2008)
- Added support of Windows 7 beta build 6801(x86,x64)
- Fixed rare bug when the system could restore an original tcpip.sys file just after it patched in Windows XP

The unlimited value as on server os is: 16777214

Homepage: http://half-open.com/
Download Site: http://half-open.com/download_en.htm
Download: http://half-open.com/Half-open_limit_fix_3.1.zip - Mirror

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