Registry Guide for Windows

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Home > Network > Protocols > TCP-IP

(Windows NT/2000/XP)
This setting controls RFC 1323 timestamps and window scaling options. Timestamps and Window scaling are enabled by default, but can be manipulated with flag bits.

This tweak can be easily applied using WinGuides Tweak Manager.
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This feature has four modes of operation:

0 = disable RFC 1323 options
1 = window scale enabled only
2 = time stamps enabled only
3 = both options enabled

Open your registry and find the key below.

Create a new DWORD value named "Tcp1323Opts" and set it to equal 0, 1, 2 or 3 depending on the required mode listed above.

Restart Windows for the change to take effect.


(Default)	REG_SZ	(value not set)
Tcp1323Opts	REG_DWORD	0x00000003 (3)


	HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\P...

Registry Settings

System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters]
Value Name: Tcp1323Opts
Data Type: REG_DWORD (DWORD Value)
Value Data: 0,1,2 or 3

Related Tweaks

Control RFC 1323 Time Stamp and Window Scaling Options (Windows 95/98/Me)

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: August 20, 2002