Team, We are experiencing a recurring problem with our NPS and Cisco Meraki MR Access Point. This issue has surfaced recently, where the AP authentication initially functions properly upon installation but stops working after 3 hours, despite no alterations to the network configuration. The notable difference in the logs is the appearance of the user as Security ID: NULL SID (previously displayed as the username). The reason for this anomaly is identified as a malformed RADIUS Request message received by the Network Policy Server from the network access server. Reason : The RADIUS Request message that Network Policy Server received from the network access server was malformed. Our network setup consists solely of Meraki APs, connected in the following sequence: MR ----> Aruba Switch ----> Palo Alto Firewall ----> RADIUS via IPsec tunnel. Looking forward to hearing from you guys soon...
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