Use this procedure to configure network access servers for use with NPS. To perform the procedures in this topic, you must have at least one network access server (VPN server, wireless access point, authenticating switch, or dial-up server) or NPS proxy physically installed on your network. On the remote NPS, configure the NPS proxy as a RADIUS client.On the NPS proxy, configure a remote RADIUS server group that contains the NPS.In this circumstance, in addition to performing the steps in this task on the NPS proxy, you must do the following: This step is also necessary when your NPS is a member of a remote RADIUS server group that is configured on an NPS proxy. RADIUS clients are network access servers - such as wireless access points, 802.1X-capable switches, virtual private network (VPN) servers, and dial-up servers - because they use the RADIUS protocol to communicate with RADIUS servers, such as Network Policy Server (NPS) servers. Client computers and devices, such as laptop computers, tablets, phones, and other computers running client operating systems, are not RADIUS clients.