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Generating Quick Response Code in C#.NET Lesson 4

Lesson 4
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Configuring ISA Server Authentication
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3. Your organization has a multiple-domain forest running Active Directory. You support various browser applications including Internet Explorer and Netscape Navigator. All browsing software is configured to use an ISA Server computer as a proxy server. You have configured access rules to allow HTTP and HTTPS traffic for all internal clients, but have not changed any other settings on the ISA Server. Some of your users have Internet access while others are always denied connections. How can you resolve this problem
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Lesson Summary
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ISA Server supports five authentication methods for restricting Internet access: Basic authentication, Digest authentication, Integrated Windows authentication, Digital Certificates authentication, and RADIUS authentication. SecureNAT clients do not support user-based authentication. You can only restrict access to the Internet based on network rules and other access rules. Firewall client authentication is performed when the client connects to the ISA Server computer. Web Proxy clients do not automatically send authentication information to ISA Server. ISA Server requests credentials from a Web Proxy client to identify a user only when processing a rule that restricts access based on a user element. If you want to restrict access to the Internet based on users and groups, you must configure ISA Server authentication to meet your organization s needs.
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Enabling Secure Internet Access with ISA Server 2004
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Lesson 5: Configuring Access Rules for Internet Access
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Now that you understand how to configure the access rule elements and how to configure authentication, you are ready to put the elements together to create access rules to enable Internet access. Access rules are used to configure all network traffic on ISA Server. Access rules define whether clients on the source network will be able to access resources on the destination network. This lesson describes how to implement access rules.
After this lesson, you will be able to
Describe what access rules are Configure access rules that enable Internet access
Estimated lesson time: 30 minutes
What Are Access Rules
Access rules are used to configure all traffic flowing through ISA Server, including all traffic from the internal network to the Internet, and from the Internet to the internal network. An access rule is graphically represented in Figure 5-18.
Access rules always define: Allow Or Deny Destination network, IP address, URL, or domain
User Set
An action on traffic from a user from a source computer to a destination with conditions
Protocol
Source Network or IP address
Schedule, content type, or application filter condition
F05im18
Figure 5-18
All access rules have the same structure.
All access rules have the same overall structure, as described in Table 5-7.
Lesson 5
Configuring Access Rules for Internet Access
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Table 5-7
Access Rule Format
Explanation Access rules are always configured to either allow or deny access. Access rules can be applied to all protocols, to specified protocols, or to all protocols except specified protocols. Access rules can be applied to specific users or all users, whether they have authenticated or not.
Access Rules Define An action To be performed on specified traffic From a particular user
Coming from a particular com- Access rules can be applied to computers based on their netputer work locations or IP addresses. Going to a particular destination Access rules can be applied to specific destinations, including networks, destination IP addresses, and domain names or URLs.
Based on particular conditions Access rules can set additional conditions, including schedules, content-type filtering, or application layer filtering
How to Configure Access Rules
To enable access for internal clients to access the Internet, you must configure an access rule that grants this type of access. You can configure the access rule using the access rule elements.
Configuring a New Access Rule
To configure a new access rule that grants access to the Internet, use the following procedure: 1. In the ISA Server Management Console tree, select Firewall Policy. 2. In the task pane, on the Tasks tab, select Create New Access Rule. 3. On the Welcome To The New Access Rule page, in Access Rule Name, enter the name for the access rule; then click Next. 4. On the Rule Action page, shown in Figure 5-19, click Allow, and then click Next.
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5
Enabling Secure Internet Access with ISA Server 2004
f05im19
Figure 5-19 Configuring the access rule action
5. On the Protocols page, shown in Figure 5-20, configure the protocols to which this access rule applies. You have three options that you can allow:
All Outbound Protocols If you choose this option, the access rule applies to all protocols coming from the source network to the destination network. Selected Protocols Click Add to add the specific protocol elements from the Add Protocols dialog box. With this option, you can specify which protocols will be allowed by this access rule. All Outbound Protocols Except Selected Click Add to add the specific protocol elements from the Add Protocols dialog box. With this option, all protocols will allowed except for the protocols that you specify.
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