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You cannot use a remote access server to apply DHCP options to a Windows Vista-based computer

Article ID: 933340 - View products that this article applies to.

SYMPTOMS

You cannot use a remote access server to apply Dynamic Host Configuration Protocol (DHCP) options to a Windows Vista-based computer. Therefore, the Windows Vista-based computer loses some TCP/IP configurations.

This problem occurs if the following conditions are true:

You configured some options on a DHCP server.
You configured a remote access server to forward DHCP information from the DHCP server.
The Windows Vista-based computer uses a virtual private network (VPN) connection to connect to the remote access server.

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CAUSE

This problem occurs because the DhcpRequestParams function does not work correctly in Windows Vista when Windows components call the function to request additional DHCP options. Therefore, the remote access server does not correctly forward DHCP information.

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RESOLUTION

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

935791

(http://support.microsoft.com/kb/935791/ )

How to obtain the latest Windows Vista service pack

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

(http://support.microsoft.com/contactus/?ws=support)

Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other previously released hotfixes.

Registry information

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

(http://support.microsoft.com/kb/322756/ )

How to back up and restore the registry in Windows

To enable this hotfix, disable the DHCP BROADCAST flag in Windows Vista. To do this, follow these steps:

Click Start
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, type regedit in the Start Search box, and then click regedit in the Programs list.

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If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dhcp\Parameters
On the Edit menu, point to New, and then click Key.
Type DhcpGlobalForceBroadcastFlag for the name of the registry subkey, and then press ENTER.
Click DhcpGlobalForceBroadcastFlag, point to New on the Edit menu, and then click Key.
Type 0 for the name of the registry subkey, and then press ENTER.

Note The registry subkey "0" signifies a remote access adapter. The following table lists other registry subkeys that you can use.
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Name (interface type) Data (broadcast bit flag value)
0 (Unknown adapters like remote access adapters) 0 or 1
1 (Wireless) 0 or 1
14 (Ethernet) 0 or 1
Any other adapter type not in this list 0 or 1
Click 0, point to New on the Edit menu, and then click DWORD Value to create a new registry entry.
Type 0 for the name of the registry entry, and then press ENTER.
Right-click 0, and then click Modify.
In the Value data box, type 0, and then click OK.
Review the final output. The final output should resemble the following:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dhcp\Parameters\DhcpGlobalForceBroadcastFlag\0] "0"=dword:00000000
Note There are three zeros that represent, respectively, the subkey name, the value name, and the value data.
Exit Registry Editor.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, 32-bit versions

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File name	File version	File size	Date	Time	Platform
Dhcpcmonitor.dll	6.0.6000.20567	10,240	28-Mar-2007	01:47	x86
Dhcpcsvc.dll	6.0.6000.20567	203,776	28-Mar-2007	01:47	x86
Dhcpcsvc6.dll	6.0.6000.20567	120,320	28-Mar-2007	01:47	x86

Windows Vista, 64-bit versions

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File name	File version	File size	Date	Time	Platform
Dhcpcmonitor.dll	6.0.6000.20567	12,288	28-Mar-2007	03:02	x64
Dhcpcsvc.dll	6.0.6000.20567	270,336	28-Mar-2007	03:02	x64
Dhcpcsvc6.dll	6.0.6000.20567	150,528	28-Mar-2007	03:02	x64

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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.

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MORE INFORMATION

For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684

(http://support.microsoft.com/kb/824684/ )

Description of the standard terminology that is used to describe Microsoft software updates

Call stack information

[3136] 12-20 15:01:36:063: IPCP:AdjustSelfInterfaceMetrics to value 0 successful
[3136] 12-20 15:01:36:063: IPCP: New Dns=
[3136] 12-20 15:01:36:063: IPCP: New Wins=
[3136] 12-20 15:01:36:063: IPCP: SaveTcpipInfo...
[3136] 12-20 15:01:36:073: IPCP: SaveTcpipInfo done(0)
[3136] 12-20 15:01:36:073: IPCP: ReconfigureTcpip(07140d0a, ffffffff)
[3136] 12-20 15:01:36:113: IPCP: ReconfigureTcpip done(0)
[3136] 12-20 15:01:37:024: DnsDisableDynamicRegistration
[3136] 12-20 15:01:37:024: DnsDisableAdapterDomainNameRegistration
[3136] 12-20 15:01:37:024: DHCP inform is happening asynchronously
[3136] 12-20 15:01:37:024: IPCP:RasPortSetProtocolCompression(s=0,0 r=0,0)
[3136] 12-20 15:01:37:024: IPCP: RasPortSetProtocolCompression done(0)
[3136] 12-20 15:01:37:024: IPCP: IpcpGetNetworkAddress...
[3136] 12-20 15:01:37:024: IPCP: IpcpGetNetworkAddress done
[256] 12-20 15:01:38:476: DhcpRequestParams({00B36FA7-0C42-4D5F-AB52-CB56733E913E})
[256] 12-20 15:01:38:476: DhcpRequestParams Start   
<---- Missing Options set
[256] 12-20 15:01:49:813: DhcpRequestParams done(0)

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