The system will limit how many times unacknowledged TCP data is retransmitted.

From Windows Server 2008 R2 Member Server Security Technical Implementation Guide

Part of TCP Data Retransmissions

Associated with IA controls: ECSC-1

SV-32359r1_rule The system will limit how many times unacknowledged TCP data is retransmitted.

Vulnerability discussion

In a SYN flood attack, the attacker sends a continuous stream of SYN packets to a server, and the server leaves the half-open connections open until it is overwhelmed and no longer able to respond to legitimate requests.

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Fix text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “MSS: (TcpMaxDataRetransmissions) How many times unacknowledged data is retransmitted (3 recommended, 5 is the default)” to “3” or less.

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