a radius message was receive from invalid radis client IP while trying to setup Duo Authentication proxy

To address the issue of receiving a RADIUS message from an invalid RADIUS client IP while setting up a Duo Authentication Proxy, you can follow these steps to troubleshoot and resolve the problem:

1. Verify Client IP Configuration:

Ensure that the IP address of the RADIUS client (e.g., your network device or application) is correctly configured in the Duo Authentication Proxy configuration file. The IP address should match the client IP address specified in the radius_ip_1 or radius_ip_2 settings of the authproxy.cfg file.

2. Check Network Connectivity:

Ensure that there is proper network connectivity between the RADIUS client and the Duo Authentication Proxy server. You can test this by pinging the Duo Authentication Proxy server from the RADIUS client.

ping duo-auth-proxy-server-ip 

3. Firewall and Security Groups:

Make sure that any firewalls or security groups between the RADIUS client and the Duo Authentication Proxy server are allowing RADIUS traffic (usually UDP port 1812 or 1645).

4. Review Logs for Detailed Errors:

Check the logs of the Duo Authentication Proxy for any additional error messages or details. The logs are usually located in the log directory within the Duo Authentication Proxy installation path. Look for any clues or specific error messages that might indicate the nature of the problem.

5. Update Duo Authentication Proxy:

Ensure you are using the latest version of the Duo Authentication Proxy. Sometimes, issues are resolved in newer versions, so updating the software might fix the problem.

6. Correct Shared Secret:

Ensure that the shared secret configured on the RADIUS client matches the shared secret specified in the Duo Authentication Proxy configuration file. The shared secret must be the same on both sides.

7. Validate Configuration Syntax:

Ensure that the authproxy.cfg file has correct syntax and no typos. Misconfigurations or typos in the configuration file can cause the proxy to reject valid RADIUS messages.

8. Test with a Known Good Configuration:

If possible, test with a known good configuration from another RADIUS client that is successfully communicating with the Duo Authentication Proxy. This can help determine if the issue is specific to the new client or a broader configuration problem.

Best regards

Rosy