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If you plan to implement client certificates, ensure that you have an efficient process in place for issuing and managing client certificates. Each client certificate must be stored on the client computer or on a device like a smart card. In large organizations with thousands of client computers, distributing and managing the client certificates can be a great deal of work. However, client certificates do provide an extra level of security if you have a Web site that requires a very high level of security.

Management Tool for additional information.)

The most important decision that you need to make when obtaining the server certificates is deciding from where you will get the certificates. You have essentially two choices: you can obtain server certificates from a commercial CA, or you can deploy a CA inside your organization and use it to issue the server certificates. Both Microsoft Windows 2000 Server and Microsoft Windows Server 2003 include a Certificate Services component that you can use to create a CA. Creating your own CA and using it to issue the server certificates has a couple of advantages. First, if you use the Certificate Services included with Windows Server, you do not have to pay for the Certificate Server software or any of the certificates. Second, if you install your own CA, you have complete control of issuing and managing the certificates.

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You can also use the System log in Event Viewer to search for errors on DHCP clients. On DHCP clients, DHCP events written to the log are designated by a source descrip tion of Dhcp. The following text provides an example of a DHCP client error registered in the event log:

Security Alert If you do decide to deploy your own CA infrastructure, you need to ensure that your CA infrastructure is very secure. If an attacker can ever compromise your root CA, or obtain a subordinate CA certificate from the root CA, every certificate issued by the CA becomes suspect. If this happens, you will need to rebuild your entire CA infrastructure and reissue all client certificates.

The IP address lease 192.168.0.11 for the Network Card with network address 00D05380B7F6 has been denied by the DHCP server 192.168.0.1 (The DHCP Server sent a DHCPNACK message).

8-36

8-37

Windows Server 2003, unlike Windows NT 4, allows you to add computers or groups of computers to an ACL, thereby adding flexibility to control resource access based on the client computer, regardless of the user who attempts access. For example, you may want to provide a public computer in the employee lounge, but prevent a manager from exposing sensitive data during his or her lunch break. By adding the computer to ACLs and denying access permission, the manager who can access sensitive data from his or her desktop is prevented from accessing it from the lounge. Windows Server 2003 also allows you to manage resource access based on the type of logon. You can add the special accounts, Interactive, Network, and Terminal Server User to an ACL. Interactive represents any user logged on locally to the console. Ter minal Server User includes any user connected via remote desktop or terminal services.

8

If you need more information about DHCP server behavior than the event log provides, consult the server audit log, as described in Lesson 2 of this chapter.

The following DHCP service messages, shown in Table 8-4, can appear in the System event log when the DHCP server database becomes corrupted.

Despite these advantages, however, you probably should not use your own CA to issue certificates for your ISA Server or public Web server. This is especially true if users from outside your organization will be accessing the Web site. The reason for this is that the client software will not be configured to trust your internal CA and the users will get an error message every time they access your Web site. PKI is built on the concept of trust; when a client computer connects to a Web server, the client checks to see if it trusts the CA that issued the server certificate. If the client is configured to trust the CA, then the SSL negotiation begins. If the client is not configured to trust the CA, the user will receive an error message, or the connection will fail. Most Web browsers are preconfigured with certificates for the most popular commercial CAs.

Table 8-4

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