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.
Before clients install Windows Server 2003 SP1,
Windows Server 2003 SP2, or an x64-based version of
Windows Server 2003, clients may have been able to connect during an SYN
attack, or they may have received error 1722. However, after installing Windows
Server 2003 SP1,
Windows Server 2003 SP2 or an x64-based version of
Windows Server 2003, clients may receive error 1727 during a SYN attack and
cannot connect.
During a SYN attack, RPC clients may receive error
1727. Before Windows Server 2003 SP1,
Windows Server 2003 SP2, or an x64-based version of
Windows Server 2003 was installed, the connection may have succeeded or the
clients may have received error 1722.
For more information about SYN attack
protection, click the following article number to view the article in the Microsoft Knowledge Base:
324270�
How to harden the TCP/IP stack
against denial of service attacks in Windows Server 2003
For more information about Winsock, click the following article number to view the article in the Microsoft Knowledge Base:
175523�
INFO: Winsock TCP connection performance to unused ports
Technical support for Windows x64 editions
Your hardware manufacturer provides technical support and
assistance for Microsoft Windows x64 editions. Your hardware manufacturer
provides support because a Windows x64 edition was included with your hardware.
Your hardware manufacturer might have customized the Windows x64 edition
installation with unique components. Unique components might include specific
device drivers or might include optional settings to maximize the performance
of the hardware. Microsoft will provide reasonable-effort assistance if you
need technical help with your Windows x64 edition. However, you might have to
contact your manufacturer directly. Your manufacturer is best qualified to
support the software that your manufacturer installed on the
hardware.
For product information about Microsoft Windows XP
Professional x64 Edition, visit the following Microsoft Web site:
For product information about Microsoft Windows Server 2003 x64
editions, visit the following Microsoft Web site: