FIGURE 21-12 The dates between security applications are around 16 hours; however, this in Visual Studio .NET

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FIGURE 21-12 The dates between security applications are around 16 hours; however, this
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machine is not always running, so the times are not exact
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Group Policy Structure
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To modify the value of the security refresh from the default 960 minutes, edit the Registry value MaxNoGPOListChangesInterval under key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\GPExtensions\{827D319E-6EAC-11D2A4EA-00C04F79F83A} and set it to the number of minutes (see Figure 21-13) This is not simple or possible via a GPO, which gives some indication that you re not supposed to play with this value!
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FIGURE 21-13 The obvious way to change the security application interval; however, you
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Although you can force a refresh by rebooting the computer or logging off and on, this is inconvenient There might be times, especially during testing, when you don t want to wait the potential two hours for background refreshing to take effect Refresh Group Policy manually using the GPupdate command-line utility locally on the computer whose policies need refreshing For those Windows 2000 clients, GPupdate does not exist; instead, use the secedit command with the /refreshpolicy parameter and either user_policy or machine_policy for example, secedit /refreshpolicy user_policy If you run GPupdate with no parameters, an update of the user and computer policy settings that have changed is performed, as shown here:
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C:\Users\john>gpupdate Updating Policy
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21 GROUP POLICY
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21
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User Policy update has completed successfully Computer Policy update has completed successfully
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Remember that GPupdate applies an update of the settings that have changed As mentioned previously, Group Policy utilizes optimization during a refresh and only applies settings that have been modi ed since the last application There might be times you want to force the reapplication of all policies, and this is accomplished by adding /force to the gpupdate command Each of the User and Computer policies are applied separately; it is possible to update only the User or Computer parts of the Group Policy via the /target parameter and specify user or computer For example, to update only the user portion of Group Policy, use the command gpupdate /target:user Other more advanced parameters are available with GPupdate For example, by default, GPupdate waits 10 minutes for the policy to complete before returning control of the command session You can change this timeout via the /Wait parameter, and the details can be found in the help (gpupdate / ) As mentioned previously, there are certain settings that can take effect only at computer startup (software installation) and user logon (software installation and folder redirection) If GPupdate encounters software installation or folder redirection, it is not able to process unless you add the /logoff or /boot switches; this performs a logoff or reboot, respectively, if GPupdate nds Group Policy changes that can take effect only from a computer s startup or logon The nal setting is the /Sync parameter, which when set forces the next initial Group Policy application to be done synchronously In other words, it does not show the logon dialog until computer Group Policy processing is complete, and it does not show the desktop until user Group Policy processing is complete
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One nal point to consider about Group Policy application is the speed of the link through which the client is connected to receive policies You obviously don t want clients trying to perform large software deployments when connected via a slow link For example, if you are on a week s cruise in the Caribbean and connect via the ship s 32kbps connection to check email, you would be rather upset if Of ce 2007 started to download and install Group Policy, therefore, understands slow links; when a slow link is detected, certain policies are not applied By default, pre-Windows Vista clients attempted to ping a domain controller four times; if the average
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ping time was greater than that de ned for a slow link, then only certain Registry-based, EFS Recovery, IPSec, and security policies were applied By default, a slow link is considered 500Kbps or slower However, you can change this via the Group Policy slow link detection policy under Computer Configuration, Administrative Templates, System, Group Policy To disable slow link detection, set it to 0 However, this is not advisable because this causes any link to be considered fast, and the system processes all the elements of applicable GPOs This ping-based process has changed in Windows Vista and Windows Server 2008 Basing the network speed on ping tests had signi cant problems if ICMP was turned off at routers (ICMP is used for PING), or if a link was high bandwidth but had high latency (for example, with satellite connections) Pinging also had issues in VPN situations or if a computer was put into hibernate or standby Also, if a computer was moved to a new network and the computer resumed the network link, speed tests were not re-performed Windows Vista has improved network awareness via Network Location Awareness (NLA) version 20, which no longer uses ICMP, so no more PING The NLA informs the Group Policy modules when suf cient network connectivity is available to allow processing of Group Policy instead of the old time-out that had to occur via the PING scenario When NLA tells Group Policy a domain controller is now able to be contacted, Group Policy application is performed, even if the connectivity is via a VPN This is useful for disconnected computers who only connect via VPN; now, as soon as the VPN connection is made, the Group Policy client is noti ed and initiates a background refresh This noti cation from the NLA improves Group Policy all around If a network adapter is disabled or disconnected, Group Policy reduces its wait time because it knows the network is not available, which decreases startup times A nal word: If you intend to use Network Quarantine (see 8, Remote Access and Securing and Optimizing the Network, for more detail), there is additional con guration required This is discussed when you con gure Network Access Protection
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