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Change in SYN attack protection in Windows Server 2003 Service Pack 1 and in x64-based versions of Windows Server 2003

Wednesday, 12 January 2011 10:08

Start64!This article discusses a change in the way that Microsoft Windows Server 2003 responds to Winsock connections during a SYN attack after you install Microsoft Windows Server 2003 Service Pack 1 (SP1), Windows Server 2003 SP2, or an x64-based version of Windows Server 2003. This change is designed to help improve protection against SYN attacks. Because of this new functionality, some programs may no longer work correctly while the server is under attack.


When SYN attack protection is enabled in Windows Server 2003 SP1, Windows Server 2003 SP2, or in an x64-based version of Windows Server 2003, the TCP RST (reset) packet is sent to end the TCP session after the three-way handshake during a SYN attack. Before you install Windows Server 2003 SP1, Windows Server 2003 SP2, or an x64-based version of Windows Server 2003, the TCP RST packet is sent during the three-way handshake. Because of this timing change, some programs may not try to reconnect after the initial unsuccessful connection attempt.

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