Fix Radius Server 'Not Responding' Error: A Step-by-Step Guide

Updated at: 23/06/2025

Is your Radius server refusing to cooperate, leaving you locked out? A "Not Responding" error can cripple network access. This step-by-step guide provides practical solutions to troubleshoot and fix this frustrating problem. We'll cover common causes, from simple network hiccups to more complex server issues, offering clear instructions to get your network back online quickly. Let's get started!

Step-by-Step Instructions

  1. Configure Network Bridge

    • Create a new bridge.
    • Add a new address (example user management and a new IP address to the interface).
    Add a new address (example user management and a new IP address to the interface). Add a new address (example user management and a new IP address to the interface).
    Configure Network Bridge

  2. Configure Radius Server Settings

    • Go to the Radius server settings and edit the relevant settings (IB).
    Go to the Radius server settings and edit the relevant settings (IB).
    Configure Radius Server Settings

  3. Configure Firewall Rules

    • Go to the firewall and add a new rule (accept incoming connections on the relevant ports).
    Go to the firewall and add a new rule (accept incoming connections on the relevant ports).
    Configure Firewall Rules

  4. Verify User Management Settings

    • Go to the user management section and verify settings.
    Go to the user management section and verify settings.
    Verify User Management Settings

  5. Test the Connection

    • Connect to the Wi-Fi and test the connection with the newly configured settings.
    Connect to the Wi-Fi and test the connection with the newly configured settings.
    Test the Connection
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Tips

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Common Mistakes to Avoid

1. Incorrect Configuration Files

Reason: Typos, incorrect paths, or missing entries in the Radius server's configuration files (e.g., radiusd.conf, raddb/clients) can prevent it from starting or responding correctly.
Solution: Carefully review and correct any errors or omissions in the relevant configuration files, ensuring all paths, usernames, passwords, and shared secrets are accurate.

2. Network Connectivity Issues

Reason: Problems with network connectivity, such as incorrect IP addresses, firewall rules blocking Radius traffic (UDP ports 1812 and 1813), or network cable issues, can prevent clients from reaching the Radius server.
Solution: Verify network connectivity to the Radius server, check firewall rules to ensure Radius traffic is permitted, and ensure all network cables are properly connected.

FAQs

My Radius server is showing 'Not Responding', but other services on the same server are working fine. What could be the problem?
This suggests the issue is specific to the Radius service itself, not a general server failure. Check the Radius server's logs for error messages. Possible causes include misconfiguration of the Radius daemon, resource exhaustion (high CPU/memory usage), or a problem with the database it uses to store user credentials. Restarting the Radius service is a good first step, followed by checking its configuration files and resource usage.