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Computers that have been configured to use the firewall s DMZ are completely exposed to the outside network (and if the firewall is also providing network address translation [NAT], a computer in the DMZ is exposed using the firewall s external IP address) This computer should be locked down tightly using a software firewall and should be configured to provide only VPN server services This will allow external computers to establish a VPN connection safely into the network If the firewall is also providing NAT, the firewall could instead be configured to forward VPN traffic to the VPN server behind the firewall External hosts cannot directly request access to hosts on a private LAN, so the firewall is left to play matchmaker and ensure that the incoming requests are forwarded to the correct internal server and nowhere else.

In addition, the security context is usually different when a user or computer is operating on a stand-alone basis, in a mixed network domain, or as part of an Active Directory domain For more information about security principals and how the security context is created, see 17, Managing Authorization and Access Control..

Even though most Windows applications run in the security context of the user who starts them, this is not true of services. Many Windows services, such as network and printing services, are launched by the service controller when you start your computer. Services continue to run after the last human user logs off. Services have to log on using accounts to access domain resources just as human users and Windows XP Professional based computers do. Note Services normally run in security contexts known as Local System, Network Service, or Local Service. Before starting a service, the service controller logs on using the account designated for the service and presents the service s credentials for authentication by the LSA. For example, when a Windows XP Professional computer joins a domain, the messenger service on the computer connects to a domain controller and opens a secure channel to it. To obtain an authenticated connection, messenger must have credentials that the remote computer s LSA trusts. LSA uses the credentials for the local computer s domain account, as do all other services running in the security context of the Local System.

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Most software firewalls offer relatively simple interfaces for configuring the incoming ports, whereas many hardware firewalls (especially business class equipment) can require moderate expertise to configure them correctly You might also want to consider purchasing a firewall/gateway/switch device that includes a built-in VPN server These devices are becoming increasingly common and allow for the greatest ease of setup when you want to provide secure VPN services to a small-to-medium size network For more information on configuring firewalls to work with a VPN, see the white paper Virtual Private Networking with Windows 2000: Deploying Remote Access VPNs, available at wwwmicrosoftcom/windows2000/techinfo/planning/incremental/vpndeployasp..

The rights and permissions for a user, computer, or group are determined by access control lists (ACLs) and contain security identifiers (SIDs) for a user, computer, or group. A security identifier (SID) is a unique value that identifies a user, group, or computer account within an enterprise. Every account is issued a SID when it is created. Access control mechanisms in Windows XP Professional identify security principals by SID instead of by name. Therefore, even if the name of a security principal changes, the SID remains the same. In addition to your own unique SID, you are identified by the SIDs of the groups to which you belong. This information is stored in an access token, which encapsulates all data that relates to your identity and security context during a given session. Access tokens An access token is re-created every time a security principal logs on, and it contains the following information: