NoteHKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
| Data type | Range | Default value |
|---|---|---|
| REG_DWORD | 0 | 1 | 0 |
Determines whether the SYN flooding attack protection feature of TCP/IP is enabled. SYN flooding attack protection is enabled when the value of this entry is 1 and the value of TcpMaxConnectResponseRetransmissions is at least 2 (see note below).
The SYN flooding attack protection feature of TCP detects symptoms of SYN flooding and responds by reducing the time server spends on connection requests that it cannot acknowledge.
| Value | Meaning |
|---|---|
| 0 | SYN flooding attack protection is not enabled. |
| 1 | SYN flooding attack protection is enabled. |
Note
This value is used only when the number of SYN-ACK retransmissions is likely to impair the server, that is, when the value of TcpMaxConnectResponseRetransmissions is at least 2.
Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.
Related Entries
TcpMaxConnectResponseRetransmissions