Registry Guide for Windows Registry Guide for Windows
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Registry tweaks, tricks & hacks to optimize, enhance and secure Microsoft Windows.

Modify the Initial Retransmission Timeout (Windows NT/2000)
Category: Home > Network > Protocols > TCP-IP

This parameter controls the initial retransmission timeout used by TCP on each new connection. It applies to the connection request (SYN) and to the first data segment(s) sent on each connection.

Open your registry and find the key below.

Create a new DWORD value, or modify the existing value called 'InitialRtt' using the settings below.

Exit your registry, you may need to restart or log out of Windows for the change to take effect.

Registry Editor Example
|NameTypeData|
|(Default)REG_SZ(value not set)|
|InitialRttREG_DWORD0x00000bb8 (3000)|
-
|HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters|
-

Settings:
System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters]
Name: InitialRtt
Type: REG_DWORD (DWORD Value)
Value: 0-65535 milliseconds (decimal)

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.

Last Modified: June 20, 2001

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