The VPN client uses the IP address returned by DNS to send a connection request to the VPN gateway. The Windows VPN client uses a public DNS server to perform a name resolution query for the IP address of the VPN gateway. The process is composed of the following steps: You'll create a sample infrastructure that shows you how to implement an Always On VPN connection process. In this tutorial, you'll learn how to deploy Always On VPN connections for remote domain-joined Windows client computers. Next: 2 - Configure Certificate Authority templatesĪpplies to: Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows 10, Windows 11.He’s also the founder of NoWiresSecurity, a cloud-based Wi-Fi security service, and On Spot Techs, an on-site computer services company. For wide-system issues you may find that an issue with the server configuration is being logged, and for denied-client requests you might see error details in the logs.Įric Geier is a freelance tech writer - keep up with his writings on Facebook. Looking through any logs or verbose output on the server may help you identify issues. In Windows Vista or later, you can perform wireless tracing with the netsh wlan commands. In Windows XP you can use the netsh ras commands. Consider using Radius Test, a Windows-based GUI and command-line tool, or Radlogin, which is available for Windows, FreeBSD, Sparc Solaris or Linux.įor further troubleshooting of Windows clients, consider utilizing the tracing features of the Netsh command-line tool to help identify the underlying issue. For instance, verify any Called-Station-ID, Calling-Station-ID, or Login-Time, or any vendor-specific attributes that may be configured on the RADIUS server.įor further debugging you might find it useful to use simulated clients to send requests to the RADIUS server and check the reply. If you’re having authentication issues, especially with a particular user or user group, double-check any authorization attributes or limits that may be enabled on the RADIUS server. If there’s a single-user issue, make sure to verify any access settings for that user in the database, such as the remote access policy on Windows Servers. If you’re having system-wide issues, verify that the database configured with the RADIUS server is up and running properly. For clients that support server validation, ensure the correct settings are chosen, such as the RADIUS server address and CA certificate. For clients that support user and machine authentication, ensure the correct one is chosen. If you don’t use static IP addresses verify that the NAS’s IP hasn’t changed and that it still matches the IP listed with the RADIUS server.įor single-client issues, verify the client is correctly configured with the right authentication settings and is using valid login credentials, including the username/password, security certificate, and/or assigned domain. Double-check the IP address, port, and shared secret. If you’re having issues with multiple clients connecting through a particular NAS, ensure that it’s configured correctly. If you’re having system-wide issues or running into issues with adding a new type of NAS or client you should verify that the server, NAS and client all support the authentication protocol you’re trying to use and that they are configured accordingly. If you’re using an authentication protocol that requires a user certificate, ensure it is within the validity period, properly installed, and that it hasn’t been revoked. If you’re having connectivity issues with a single client, ensure the security certificate for the certificate authority (CA) is within the validity period, properly installed on the client, and that the client is set to the correct time and date. Ensure that it is within the validity period, properly installed, and that the server is set to the correct time and date. If you’re having system-wide issues you should first verify that the security certificate loaded on the RADIUS server is okay. Whether you’re running the server for 802.1X, VPN or other network authentication purposes, you’ll discover general troubleshooting tips that apply among all Network Access Servers (NAS) and clients. In our latest server tutorial we’ll discuss some items and settings you can review when troubleshooting RADIUS (Remote Authentication Dial-In User Service) issues on your network.
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