NPS also uses the dial-in properties of the user account to make an authorization determination. Because network policies are processed in the order in which they appear in the NPS snap-in, plan to place your most restrictive policies first in the list of policies. For each connection request, NPS attempts to match the conditions of the policy with the connection request properties. NPS examines each network policy in order until it finds a match.
If it does not find a match, the connection request is rejected. Determine the preferred NPS processing order of network policies, from most restrictive to least restrictive.
Determine the policy state. The policy state can have the value of enabled or disabled. If the policy is enabled, NPS evaluates the policy while performing authorization.
If the policy is not enabled, it is not evaluated. Determine the policy type. You must determine whether the policy is designed to grant access when the conditions of the policy are matched by the connection request or whether the policy is designed to deny access when the conditions of the policy are matched by the connection request.
For example, if you want to explicitly deny wireless access to the members of a Windows group, you can create a network policy that specifies the group, the wireless connection method, and that has a policy type setting of Deny access. Determine whether you want NPS to ignore the dial-in properties of user accounts that are members of the group on which the policy is based.
When this setting is not enabled, the dial-in properties of user accounts override settings that are configured in network policies. For example, if a network policy is configured that grants access to a user but the dial-in properties of the user account for that user are set to deny access, the user is denied access.
But if you enable the policy type setting Ignore user account dial-in properties, the same user is granted access to the network. Determine whether the policy uses the policy source setting. This setting allows you to easily specify a source for all access requests. Alternatively, you can specify a vendor-specific source. Determine the settings that are applied if the conditions of the network policy are matched by the connection request. Recording user authentication and accounting requests in log files is used primarily for connection analysis and billing purposes, and is also useful as a security investigation tool, providing you with a method for tracking the activity of a malicious user after an attack.
Choose the type of information that you want to log. You can log accounting requests, authentication requests, and periodic status. With this approach, Applications Manager exposes processing bottlenecks on the NPS and how they impact policy matching. The NPS also provides a central accounting recording service for all accounting requests sent by the clients. The accounting request and response measures serve as effective indicators of the workload on the NPS server.
Accounting data can also assist with network access troubleshooting. With Applications Manager, you can easily track accounting requests and responses between NPS and clients; uncover the load on a server to pinpoint irregularities in load balancing; proactively detect potential slowdowns, accurately isolate what is causing it, and promptly fix the problem.
Share This Article. NPS Shortcomings While this approach worked well for a number of years, as the IT landscape shifts to the cloud, there is a great deal of concern over whether a Microsoft Windows NPS server is actually required anymore. Never Miss a Post. Continue Learning with Related Posts. You can configure NPS with any combination of these features. NPS provides different functionality depending on the edition of Windows Server that you install.
As a RADIUS server, NPS performs centralized connection authentication, authorization, and accounting for many types of network access, including wireless, authenticating switch, dial-up and virtual private network VPN remote access, and router-to-router connections.
The same set of credentials is used for network access control authenticating and authorizing access to a network and to log on to an AD DS domain. NPS uses the dial-in properties of the user account and network policies to authorize a connection. Internet service providers ISPs and organizations that maintain network access have the increased challenge of managing all types of network access from a single point of administration, regardless of the type of network access equipment used.
If user credentials are authenticated and the connection attempt is authorized, the RADIUS server authorizes user access on the basis of specified conditions, and then logs the network access connection in an accounting log.
The use of RADIUS allows the network access user authentication, authorization, and accounting data to be collected and maintained in a central location, rather than on each access server. NPS records information in an accounting log about the messages that are forwarded. With NPS, organizations can also outsource remote access infrastructure to a service provider while retaining control over user authentication, authorization, and accounting.
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