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Enabling Secure Internet Access with ISA Server 2004
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If your organization is using a Web browser other than Internet Explorer, you might want to consider deploying the Firewall Client to all client computers. When a Firewall client connects to the ISA Server computer, the user is authenticated using the encrypted control channel. Then you can use any browser to access Internet resources without requiring additional authentication.
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It is always a good idea to keep the default setting for any configuration item in mind when writing the exam. For example, the fact that the default authentication method for Internet access is Integrated authentication means that, by default, only Internet Explorer Web browsers can be used if authentication is required.
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When access rules that apply to Web Proxy clients are configured to apply to users (and not to IP addresses), at least one authentication mechanism must be specified so that the users making the requests can be authenticated. If no authentication mechanism is specified, then all requests will be denied. To configure authentication for Internet requests, complete the following steps: 1. In the Microsoft ISA Server Management Console tree, expand the Configuration node and select Networks. 2. On the Networks tab, click Internal. Click Edit Selected Network. 3. Click the Web Proxy tab, and then click Authentication to access the Authentication dialog box, shown in Figure 5-17. The configuration options are described in Table 5-6.
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F05im17
Figure 5-17 Table 5-6
Configuring authentication for Internet requests
Authentication Configuration Options
Explanation Configure the method or methods of authentication supported by the ISA Server computer. Configure ISA Server to allow only authenticated users to access other networks. If you choose this option, SecureNAT clients will not be able to access the Internet using this ISA Server. Configure the default domain that will be used for authentication when using Basic, Digest, or RADIUS authentication. Configure the RADIUS server that will be used for authentication.
Configuration Option Authentication Method Require All Users To Authenticate Authentication Domain RADIUS Servers
Practice: Configuring ISA Server Authentication
1. In the Microsoft ISA Server Management Console tree, expand the Configuration node and select Networks. 2. On the Networks tab, click Internal. Click Edit Selected Network. 3. Click the Web Proxy tab, and then click Authentication. 4. Select the check box beside Require All Users To Authenticate. 5. Click Basic. Click OK to accept the warning message. 6. Click Select Domain. In the Select Domain dialog box, in the Domain Name text box, type cohovineyard.com. Click OK.
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Enabling Secure Internet Access with ISA Server 2004
7. Click OK to close the Authentication dialog box, and then click OK to close the Internal Properties dialog box. 8. Click Apply to apply the changes.
Lesson Review
Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. Your organization has a mixture of Windows 2000 and Windows 2003 domain controllers. You have deployed ISA Server 2004 as your firewall solution. Your Internet usage policy states that all users accessing the Internet will be authenticated using Digest authentication. You have configured the properties of the Internal network to require Digest authentication. Now none of your users can access the Internet. How can you correct this problem
2. All the clients in your organization are configured as SecureNAT clients. You have created content type elements to prevent users from downloading executables, MP3 and video file types. You use those elements in an access rule and assign it to the All Authenticated Users group. After applying the access rule, you discover that all your clients still have unrestricted access to download the content types. Why can users still download the content types that you are trying to block What should you do to prevent this
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