![]() ![]() In addition, configure your network so that there are multiple paths between servers running NPS and domain controllers. If the problem is not temporary and NPS frequently has trouble contacting domain controllers to perform authentication and authorization for connection requests, add more backup domain controllers to the network.Domain controllers might respond shortly, and NPS will switch to other domain controllers automatically. Wait for a domain controller to respond to NPS. One or more domain controllers might be offline due to reboots or other issues, such as hardware failure or temporary network congestion.To perform this procedure, you must be a member of Domain Admins. If NPS cannot contact domain controllers, it cannot perform authentication and authorization, and network access authentication will fail.Äomain controller %1 for domain %2 is not responsive. Network Policy Server (NPS) contacts domain controllers to perform authentication and authorization for connection requests received from configured RADIUS clients. ![]() Event ID 4401 - NPS and Domain Controller Communication ![]()
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