Modifying TCP/IP Fields May Disable DHCP Relay Agent Service (227880)

The information in this article applies to:

Microsoft Windows NT Server 4.0 Terminal Server Edition
Microsoft Windows NT Server 4.0
Microsoft Windows NT Server 4.0 SP1
Microsoft Windows NT Server 4.0 SP2
Microsoft Windows NT Server 4.0 SP3
Microsoft Windows NT Server 4.0 SP4

This article was previously published under Q227880

SYMPTOMS

When you run Microsoft Windows Server version 4.0 or later on a computer with only one network adapter, changing any of the TCP/IP properties in Control Panel causes the DHCP Relay Agent service running on that computer to become disabled. Consequently, when you restart the computer, the DHCP relay agent service does not start.

CAUSE

This problem occurs because there was a restriction on having at least two network adapters to use the DHCP Relay Agent service. This restriction has been removed. DHCP Relay agent Service is usually run on multihomed computers. However, in certain specific scenarios, such as an old router that does not support DHCP RFC 1542, you may want the service configured on a computer with only one network adapter to forward DHCP packets through unicast to a DHCP server.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:

http://www.microsoft.com/windows/servicepacks/ -or-
152734 how to obtain the latest windows nt 4.0 service pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows NT Server version 4.0, Terminal Server Edition Service Pack 6.

Modification Type:	Minor	Last Reviewed:	9/23/2005
Keywords:	kbHotfixServer kbQFE kbbug kbfix kbQFE KB227880