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Test for Network Connectivity
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A second common reason why SecureNAT clients cannot connect to the Internet is due to network routing configuration. SecureNAT clients must be able to connect to the internal network interface on the ISA Server computer. If you have a single subnet on your network, check the client default gateway configuration. If you have multiple subnets, then check the routing configuration.
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Lesson 2
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Configuring the SecureNAT and Web Proxy Clients
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Review the Access Rule Configuration
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If the DNS configuration is correct, and the client computer can connect to the ISA Server computer, the next step is to check the access rule configuration on ISA Server. By default, all access to the Internet is blocked by ISA Server, so you must enable access before the client computers can connect.
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See Also We will explore access rule configuration and issues such as access rule order in much more detail in 5.
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Remember the ISA Server Client Limitations
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When troubleshooting SecureNAT and Web Proxy connection problems, remember that these clients are limited in their functionality. Web Proxy clients can only access resources using HTTP, HTTPS, or FTP over HTTP. SecureNAT clients do not support authentication, so clients will not be able to use any access rule that requires authentication. SecureNAT clients also do not support all protocols.
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Exam Tip Because SecureNAT clients do not support authentication, any access rule that requires authentication will block access to SecureNAT clients. For example, you could have an access rule that allows all protocol traffic from the Internal network to the Internet. If that rule is applied to Authenticated Users, all SecureNAT clients will be blocked. If that rule is the first rule evaluated by ISA Server, all SecureNAT client connections will be blocked.
Practice: Configuring SecureNAT and Web Proxy Clients
In this practice, you will configure logging using the ISA Server Management Console to monitor client connections to the server. You will then configure a SecureNAT client and a Web Proxy client and test the client connections. Because you do not have an access rule defined on ISA Server to enable access to Web resources on other networks, you cannot actually connect to Web resources.
Exercise 1: Configuring ISA Server 2004 to Log Client Connections
1. On ISA1, open ISA Server Management, expand ISA1, and then click Monitoring. 2. On the Logging tab, in the Details pane, click Start Query. When you click Start Query, ISA Server will show all client connections on the Logging tab.
Exercise 2: Configuring and Testing a SecureNAT Client
1. On DC1, log on to the cohovineyard.com domain as an administrator. 2. Open a Command Prompt and type IPConfig /all. Verify that the server s default gateway is configured to use the ISA Server internal IP address.
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Installing and Managing ISA Server Clients
3. Open Internet Explorer. Try connecting to http://131.107.1.200. The connection will fail. 4. Close the open windows. 5. On ISA1, in ISA Server Management, locate the events logged that used the HTTP protocol. Confirm that the HTTP request was denied by the Default rule.
Exercise 3: Configuring and Testing a Web Proxy Client
1. On CLIENT1, log on as an Administrator. 2. Open Internet Explorer. Click Tools, and then click Internet Options. 3. In the Internet Options dialog box, click the Connections tab. 4. Click LAN Settings. On the LAN Settings page, click Use A Proxy Server For Your LAN. In the Address box, type ISA1. In the Port box, type 8080. 5. Select Bypass Proxy Server For Local Addresses. Click OK twice. 6. In the Address box, type 131.107.1.200. The connection will fail. 7. Review the Proxy Message. 8. Switch to the ISA1 virtual machine and locate the events logged that used the HTTP protocol and the Destination Port of 8080. Confirm that the request was denied by the Default rule. 9. On the Tasks tab, click Stop Query. Close all open windows.
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 the questions in the Questions and Answers section at the end of this chapter. 1. You use ISA Server 2004 to publish a public Web site on an internal Web server. What ISA Server client, if any, needs to be configured on the Web server a. Firewall client. b. SecureNAT client. c. Web Proxy client. d. No client configuration is required.
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