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September 23, 2002—In this issue:

1. COMMENTARY

2. FAQS

  • Q. How can I configure my DHCP clients to request unicast responses from my DHCP server?
  • Q. How can I resolve 2351 and 2355 errors that I receive while installing software from a CD-ROM?
  • Q. How can I prevent Macromedia Shockwave Player content from displaying in Microsoft Internet Explorer (IE)?
  • Q. How can I prevent Microsoft Internet Explorer (IE) from caching Secure Sockets Layer (SSL) pages?
  • Q. What is Windows XP Media Center Edition?

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  • Managing Large-Scale Active Directory Deployments

4. ANNOUNCEMENTS

  • Take Our Quick Survey and You Could Win a $200 Gift Certificate!
  • We Have Two Questions for You ...

5. CONTACT US

  • See this section for a list of ways to contact us.

1. COMMENTARY
(contributed by John Savill, FAQ Editor, jsavill@winnetmag.com)

This week, I explain how to configure DHCP clients to request unicast responses from a DHCP server, how to resolve errors you might receive when installing new Microsoft-based software, and how to turn off Macromedia Shockwave Player functionality in Microsoft Internet Explorer (IE). I also tell you how to prevent IE from caching secure pages and describe Microsoft's new Windows XP Media Center Edition.

I don't have any major news to report this week, but I have heard that since the release of XP Service Pack 1 (SP1), Microsoft has quietly inserted a number of fixes, including fixing the sniffing of passwords sent over RDP for XP Terminal Services and remote desktop sessions. Microsoft has also released some preliminary information regarding its new wireless network hardware collection at http://www.microsoft.com/hardware/broadbandnetworking/default.aspx.

In a previous commentary, I mentioned a Web-based tool you can use to test the security of your email system. The vendor, GFI Software, has updated the tool with some extra tests (e.g., testing for an email exploit that makes use of a fragmented message vulnerability and can bypass most unpatched content-filtering solutions that claim to protect against viruses). Take a look at http://www.gfi.com/emailsecuritytest.

2. FAQS

  • Q. How can I configure my DHCP clients to request unicast responses from my DHCP server?
  • A. Unicast is any network communication between a single sender and a single receiver. DHCP server responses typically use multicast communication to broadcast to all DHCP clients within a limited broadcast address (e.g., 255.255.255.255). However, you can configure the registry on Windows NT 4.0 or later DHCP servers to let clients request a unicast response, rather than a multicast response, from the DHCP server by performing the following steps:

    1. Start a registry editor (e.g., regedit.exe).
    2. Navigate to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DHCPServer\Parameters registry subkey.
    3. Double-click IgnoreBroadcastFlag (or create this value of type DWORD if it doesn't already exist).
    4. Set IgnoreBroadcastFlag to 1 to ignore the DHCP client request flag and always use multicast responses or 0 to let the client choose between unicast or multicast, then click OK.
    5. Close the registry editor.
    6. Reboot the server.

    Pre-NT 4.0 DHCP versions will ignore this registry setting.

  • Q. How can I resolve 2351 and 2355 errors that I receive while installing software from a CD-ROM?
  • A. When you install software from a CD-ROM that uses the Windows Installer Setup engine, you might receive either of the following errors:

    • Internal Error 2351: Please contact product support for assistance.
    • Internal Error 2355: Please contact product support for assistance.

    These errors are the result of a bug that causes a problem when the Setup engine extracts files from the compressed cabinet format (CAB) file on the CD-ROM. To resolve this problem, you need to install the latest Windows OS service pack (Microsoft first addressed this problem by including a fix in Windows 2000 Service Pack 2—SP2). As a workaround, you can copy the contents of the CD-ROM to the local hard disk and attempt installation or you can attempt to boot into safe mode before performing the installation.

  • Q. How can I prevent Macromedia Shockwave Player content from displaying in Microsoft Internet Explorer (IE)?
  • A. To disable Shockwave Player content in IE, perform the following steps:

    1. Start a registry editor (e.g., regedit.exe).
    2. Navigate to the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility registry subkey.
    3. From the Edit menu, select New, Key.
    4. Enter a name of "\{166B1BCA-3F9C-11CF-8075-444553540000\}" without the quotes, then press Enter.
    5. Select the new key, then, from the Edit menu, select New, DWORD Value.
    6. Enter a name of "Compatibility Flags" without the quotes, then press Enter.
    7. Double-click the new value, set it to 400 (hexadecimal mode), then click OK.

    To reenable Shockwave Player content, set the registry value to 0.

  • Q. How can I prevent Microsoft Internet Explorer (IE) from caching Secure Sockets Layer (SSL) pages?
  • A. By default, IE caches all pages, regardless of whether the pages are secure (e.g., HTTP Secure—HTTPS—pages, which use SSL). If you don't want IE to cache these secure pages, you can perform the following steps for each user:

    1. Start a registry editor (e.g., regedit.exe).
    2. Navigate to the HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings registry subkey.
    3. From the Edit menu, select New, DWORD Value.
    4. Enter a name of DisableCachingOfSSLPages, then press Enter.
    5. Double-click the new value, set it to 1 to disable caching of SSL pages, then click OK.
    6. Close the registry editor.
    7. Log off and log on for the change to take effect.

  • Q. What is Windows XP Media Center Edition?
  • A. Microsoft has added a new member to the XP family, XP Media Center Edition (formerly code-named Freestyle). Unlike XP Home Edition and XP Professional Edition, you can't purchase XP Media Center Edition—the new version of XP is available only with "Media Center" PCs (Hewlett-Packard—HP—has released one already; for details, go to http://www.hp.com/hpinfo/newsroom/press/03sep02b.htm). XP Media Center Edition provides television viewing and recording capabilities, DVD playback, and DVD recording (DVD recording lets you play back your recordings on only the machine you used to make the recording). A remote control is also supplied to provide full control over the simplified interface.

    For screen shots and more information about XP Media Center Edition, visit the first URL below. For an interview with Joe Belfiore, general manager of user experience at Microsoft's Windows eHome division, who helped guide the development of XP Media Center Edition, visit the second URL below.

    http://www.microsoft.com/windows/ehome
    http://www.winsupersite.com/showcase/freestyle_joeb.asp

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    4. ANNOUNCEMENTS
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    5. CONTACT US
    Here's how to reach us with your comments and questions:

    • ABOUT THE FAQS — jsavill@winnetmag.com
    • ABOUT THE NEWSLETTER IN GENERAL — warren@winnetmag.com
      (please mention the newsletter name in the subject line)
    • TECHNICAL QUESTIONS — http://www.winnetmag.net/forums
    • PRODUCT NEWS — products@winnetmag.com
    • QUESTIONS ABOUT YOUR Windows XP and 2000 Tips & Tricks UPDATE SUBSCRIPTION?
      Customer Support — tipsandtricks@winnetmag.com

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