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Before you can configure ISA Server to enable secure access to the Internet, you must understand what secure access means. Every organization defines this concept slightly differently because an important part of configuring secure access is defining limits to what resources users can access on the Internet. To define secure access, the organization needs to develop an Internet usage policy that prescribes how users can use the Internet. Then you can use this policy to design your ISA Server configuration to ensure that users have only the required access to the Internet. This chapter provides an overview of what is meant by secure access to the Internet, some high-level guidelines for developing an Internet usage policy and an overview of how you can use ISA Server to enforce the policy. The other lessons in the chapter provide the details of how to configure ISA Server to implement the policy.

If a user forgets his or her password, you must reset the password. You do not need to know the user s old password to do so. Simply select the user object and, from the Action menu, choose the Reset Password command. Enter the new password twice to confirm the change, and as a security best practice, select the User Must Change Password At Next Logon option.

6-12

Describe secure access to Internet resources List guidelines for creating an Internet usage policy Describe how ISA Server can provide secure access to Internet resources

6

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Almost all organizations provide some level of Internet access for their users. The use of the Internet as a source of information and e-mail as a communication tool means that most organizations cannot afford to be without access to the Internet. At the same time, ensuring that the connection to the Internet is secure is critical. So what is secure access to the Internet At a minimum, providing secure Internet access for users in an organization means the following:

Do not leave DNS debug logging enabled during normal operation because it con sumes both processing and hard disk resources. Enable it only when diagnosing and solving DNS problems.

Users can access the resources that they need. To do their jobs, users in many organizations must be able to use a Web browser or other application to access Internet resources. The connection to the Internet is secure. Users must be reasonably sure that they will not be attacked through the Internet connection. Ideally, the connection to the Internet should not reveal any information about the internal system that can be used to launch an attack against the client computer. Information about the computer, such as the computer name, user logon name, and shared folders, as well as details about the network configuration for the client computer, such as the client Internet Protocol (IP) address, should be hidden.

In this practice, you use Nslookup to perform basic DNS troubleshooting functions. You then configure the DNS log to capture packets and view the results.

5

Personnel changes may require you to disable, enable, or rename a user object. The process for doing so is similar for each action. Select the user and, from the Action menu, choose the appropriate command, as follows:

In this exercise, you use Nslookup to perform forward and reverse lookups. 1. From Computer1, log on to Domain1 as Administrator. 2. Connect Computer1 to the Internet if it is not already connected. 3. Open a command prompt and type netsh interface ip set dns local area con nection static 192.168.0.1. This command ensures that the local DNS server is queried before a remote DNS server. 4. At the command prompt, type nslookup www.msn.com., and press Enter. 5. If you receive a time-out response, type the command again. You should receive an output similar to the following:

The data that users transfer to and from the Internet is secure. In some cases, users might send confidential personal information such as credit card information to the Internet or they might send private or confidential organizational information such as client data to the Internet. This data must be secured when it leaves the organization. If the data cannot be protected, you must prevent users from sending the information to the Internet. Users cannot download malicious programs from the Internet. One of the ways attackers gain access to your network is by getting users to download malicious content. You must prevent users from inadvertently or deliberately causing damage to the network by downloading viruses or Trojan horse applications to their client computers.

Server: computer1.domain1.local Address: 192.168.0.1 Name: www.msn.com Addresses: 207.68.171.254, 207.68.172.253, 207.68.172.254, 207.68.173.253 207.68.173.254, 207.68.171.253

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