How To Enable TCP/IP Forwarding in Windows Server 2003

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article was previously published under Q323339
For a Microsoft Windows XP version of this article, see 315236.
For a Microsoft Windows 2000 version of this article, see 230082.

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SUMMARY
By default, TCP/IP forwarding is turned off (disabled) in Windows Server 2003. This article describes how to enable TCP/IP forwarding on a Windows Server 2003-based computer.

More Information

Enabling TCP/IP Forwarding

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
  1. Start Registry Editor (Regedit.exe).
  2. Locate and click the following key in the registry:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  3. Set the following registry values:

    Value Name: IPEnableRouter
    Value type: REG_DWORD
    Value Data: 1

    NOTE: A value of 1 turns on (enables) TCP/IP forwarding for all network connections installed and used by this computer.
  4. Quit Registry Editor.
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Article ID: 323339 - Last Review: 12/03/2007 04:58:56 - Revision: 7.5

Microsoft Windows Server 2003, Datacenter Edition (32-bit x86), Microsoft Windows Server 2003, Enterprise Edition (32-bit x86), Microsoft Windows Server 2003, Standard Edition (32-bit x86), Microsoft Windows Server 2003, Web Edition, Microsoft Windows Server 2003, 64-Bit Datacenter Edition, Microsoft Windows Server 2003, Enterprise x64 Edition, Microsoft Windows Small Business Server 2003 Standard Edition, Microsoft Windows Small Business Server 2003 Premium Edition

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