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Thread: SynAttackProtect is Enabled in Windows 7 by Default

  1. #1
    Regular Member KEiGHT's Avatar
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    Feb 2014

    SynAttackProtect is Enabled in Windows 7 by Default

    In red is wrong interpretation in windows 7 of SynAttackProtect


    This undocumented for Windows 7 setting provides protection against SYN denial of service (DoS) attacks. When enabled, connections timeout sooner if SYN attack is detected. When set at 1, TCPMaxDataRetransmissions can be lowered further.

    SynAttackProtect=1 (DWORD, recommended: 1, not present in registry by default)

    Correct Answer

    As of Windows Vista and onwards (Vista/2008/Win 7/2008 R2), syn attack protection algorithm has been changed in the following ways:

    1) SynAttack protection is enabled by default and cannot be disabled!

    2) SynAttack protection dynamically calculates the thresholds (of when it considers an attack has started) based on the number of CPU cores and memory available and hence it doesn’t expose any configurable parameters via registry, netsh etc.

    Last edited by KEiGHT; 03-25-15 at 07:21 AM.
    Every man has his destiny.

  2. #2
    Administrator Philip's Avatar
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    May 1999
    Jacksonville, Florida, United States
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    Thanks Keight. You are generally correct (per the documentation), however it is often the case that older settings still work (and newer settings are broken) with MS.

    This is not included in the TCP Optimizer for Windows 8/10/2012.

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