Hello BOSCHUNG Vincent,
We apologize, but as technical engineers, we can only offer tech support pertaining to your particular concerns.
To troubleshoot this issue, here are a few suggestions:
- Check NPS Configuration:
- Ensure that your Network Policy Server (NPS) is properly configured. Confirm the following:
- Domain Membership: Determine in which domain the NPS is a member. For multi-domain environments, the NPS can authenticate credentials for user accounts in its own domain and for all domains that trust the local domain of the NPS.
- RADIUS Ports: Verify the RADIUS ports used by the NPS to receive messages from RADIUS clients. The default ports are UDP 1812 and 1645 for authentication, and 1813 and 1646 for accounting.
- Event Logging: Decide which types of events you want NPS to record in the Event Log (e.g., rejected or successful authentication requests).
- Fault Tolerance: Deploy at least two NPS servers for fault tolerance. One serves as the primary RADIUS server, and the other as a backup. Configure RADIUS clients on both servers to ensure continuity.
- Configuration Script: Consider using a script to copy NPS configuration across servers to save administrative effort and prevent misconfigurations.
- Ensure that your Network Policy Server (NPS) is properly configured. Confirm the following:
- Add RADIUS Clients:
- Make sure your RADIUS clients (network access servers) are correctly configured to communicate with the NPS. Add the IP addresses of your clients as RADIUS clients in the NPS server.
- Check Firewall and Access Point Configuration:
- Verify that your firewall and access point settings allow communication between the NPS and RADIUS clients.
- Enable NPS Logs:
- If the issue persists, enable NPS logs to gain insights. In NPS, right-click on NPS (Local), go to Properties > General Tab, and ensure both successful and rejected authentication requests are checked.
Remember, NPS provides authentication, authorization, and accounting for RADIUS requests.
Plan NPS as a RADIUS server | Microsoft Learn
Remote RADIUS Server Groups | Microsoft Learn
I hope this helps you get your NPS main node back up and running!
Regards,
Karlie