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the help desk when stuck, which is an important aspect of any implementation The worst thing you can do is implement a new technology that affects users and then not have the manpower available to address user problems This is another major reason for implementing technologies in small units Stay in this mode until about 90 percent of the company meets compliance, which you can see via the NAP reporting Stage 3 Enforcement mode When you reach an agreed upon percentage of compliance in your systems (for example, the 90 percent just cited), NAP is switched to enforcement mode where noncompliant systems are placed into restricted networks or denied access You now are protecting your networks from noncompliant systems
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After all that, let s con gure a NAP enforcement Microsoft has produced amazingly detailed step-by-step guides for all the various enforcement methods It is recommended that you read them before implementing NAP The coverage in general for NAP on Microsoft is amazing The TechNet Network Access Protection page at http://technetmicrosoftcom/ en-us/network/bb545879aspx is a great start It has links to the step-bystep guides However, this section walks through an implementation of NAP to show you both the process and how to con gure NAP to match various roll-out stages Because you learned about VPNs, let s walk through enabling NAP for VPN The implementation differences for DHCP are covered later to show there is no difference from a health and network policy perspective The only differences are in calling those policies and how restricted access is governed First, ensure that Network Policy Server Role service is enabled on your NPS server Because you use NAP on your VPN, you also need a computer certi cate from your enterprise CA in the domain via the Certi cates MMC snap-in No other questions are asked, and the certi cate is saved into the Personal container of the computer account, as shown in Figure 8-30
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FIGURE 8-30 Requesting a certi cate The certi cate is necessary because NAP with VPN requires PEAP, which enables quarantine checking It is enabled by default as an authentication option, but verify this via the properties of the RRAS server Under the Security tab, click the EAP Methods button (which is checked along with MS-CHAP v2) and ensure that PEAP is listed If NAP and the VPN server are not on the same box, you need to con gure the VPN server as a RADIUS client of the NPS, as discussed in the Radius Con guration section Also, create a connection request policy on the NPS server to con gure it to authenticate connection requests from the VPN server
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A default Windows Server 2008 NPS has only one SHV: the Windows Security Health Validator Navigate to System Health Validators under the
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Network Access Protection console tree item within NPS and select the properties of the Windows Security Health Validator When the dialog is open, click the Con gure button to enable con guration of the properties you want to check for as shown in Figure 8-31 In this example, check that the rewall is enabled and that automatic updates are enabled for Windows Vista/2008 clients Notice all the options available: checks for rewall, antivirus, antispyware, automatic updating, and security updates within a de ned amount of time Concerning that last item, set things so that they must have checked within the last 22 hours for Important and above updates (see the grayed-out options in Figure 8-31) You could set the Security Update protection to Critical Only or to Moderate and Above
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FIGURE 8-31 Con guring the elements checked by the Windows Security Health Validator For the main settings of the SHV, con gure the results for the errors that might occur, such as the health agent or validator being unable to contact required services By default such errors result in the client being treated as noncompliant Now that you have de ned the SHV, create a health policy that uses it Under the Policies console tree item is a Health Polices area where you create a new policy Select the New action to create a new policy, which
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requires you to select a name for the health policy, choose the SHVs checked in the policy, and de ne which check is performed In most circumstances you want to check the Client Passes All SHV Checks option, as shown in Figure 8-32 There are also options in which the client passes at least one SHV check, the client fails all, and the client fails at least one, in addition to checks whether an SHV reports a client as infected, transitional, or unknown
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