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PPTPTcpMaxDataRetransmissions

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

Data type

Range

Default value

REG_DWORD

0x0–0xFF ( retransmissions )

0x5

Description

Determines how many times an unacknowledged Point-to-Point Tunneling Protocol (PPTP) packet is retransmitted before the connection is dropped.

This entry lets you configure a limit on PPTP retransmissions separately from the limit for regular TCP retransmissions, which is stored in the value of the TCPMaxDataRetransmissions entry. You can then adjust the TCP setting to prevent denial-of-service attacks (also known as SYN flooding ) without affecting PPTP traffic.

Note Image Note

The default value of this entry is changed for Windows 2000. For Windows NT 4.0 and earlier, the default value was 0xFFFFFFFF.

Tip Image Tip

To prevent the TCP dead gateway detection feature from inadvertently disconnecting a congested Internet link, set this value higher than the default value of the TCPMaxDataRetransmissions entry.

Related Entries

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EnableDeadGWDetect

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TCPMaxDataRetransmissions

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