MSS: (TcpMaxDataRetransmissions) How many times unacknowledged data is retransmitted (3 recommended, 5 is default) Countermeasure: Configure the MSS: (TcpMaxDataRetransmissions) How many times unacknowledged data is retransmitted (3 recommended, 5 is default) entry to a value of 3. The possible values for this registry entry are: ? 0 to 0xFFFFFFFF. The default configuration is 5. In the SCE UI, this setting can be adjusted using a text entry box: ? A user-defined number ? Not Defined Potential Impact: TCP starts a retransmission timer when each outbound segment is passed to the IP. If no acknowledgment is received for the data in a given segment before the timer expires, then the segment is retransmitted up to three times. Fix: (1) GPO: Computer ConfigurationAdministrative TemplatesMSS (Legacy)MSS: (TcpMaxDataRetransmissions) How many times unacknowledged data is retransmitted (3 recommended, 5 is default) (2) REG: HKEY_LOCAL_MACHINESystemCurrentControlSetServicesTcpipParameters!TcpMaxDataRetransmissions

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(1) GPO: Computer Configuration\Administrative Templates\MSS (Legacy)\MSS: (TcpMaxDataRetransmissions) How many times unacknowledged data is retransmitted (3 recommended, 5 is default) (2) REG: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters!TcpMaxDataRetransmissions