Скачать или смотреть Troubleshooting EAP-TLS Authentication Issues on Android 11 with FreeRADIUS

A comprehensive guide for resolving EAP-TLS authentication problems on Android 11 devices when used with FreeRADIUS servers.
---
This video is based on the question https://stackoverflow.com/q/75583270/ asked by the user 'Or benet' ( https://stackoverflow.com/u/9178754/ ) and on the answer https://stackoverflow.com/a/75668617/ provided by the user 'Or benet' ( https://stackoverflow.com/u/9178754/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: EAP-TLS with Android 11 and Freeradius 3 Failing

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Troubleshooting EAP-TLS Authentication Issues on Android 11 with FreeRADIUS

If you're encountering problems with EAP-TLS authentication on your Android 11 devices using a FreeRADIUS server, you're not alone. Many users face challenges in getting their setups to work, especially after managing to get past the TLS handshake phase. In this guide, we'll explore a specific issue observed in a similar scenario and provide concrete solutions to help you resolve your own authentication problems.

Understanding the Problem

The challenge arises when attempting to establish a secure EAP-TLS connection between Android 11 devices and FreeRADIUS. Users often find that after completing the TLS handshake, the EAP process fails, leading to repeated authentication requests. This situation can be incredibly frustrating, especially when tests have been conducted, and configurations appear correct.

Common Signs of an Issue

Here are some indications that you might be facing similar problems with EAP-TLS on your setup:

The client device continually sends new requests to the FreeRADIUS server.

Server logs show errors related to TLS connections, such as tlsv1 alert internal error or fatal: internal error.

The Solutions: Step-by-Step Guide

To resolve these issues effectively, we can follow a two-pronged approach: addressing network configurations and ensuring certificate integrity.

1. Network Configuration Adjustments

In some instances, the problem may be linked to network configurations, particularly those involving firewalls or packet handling.

Check Your Firewall Settings: Make sure that your internal firewall is not interfering with packet transmission.

If you have FreeBSD packet scrubbing and fragment re-assembly enabled, consider disabling these features temporarily. In one case, doing so allowed for successful authentication, as previously dropped packets were permitted through.

2. Certificate Validation

It's crucial to ensure that your SSL/TLS certificates are correctly set up for your specific infrastructure.

Review Certificate Attributes: Double-check all settings pertaining to your certificates, particularly those that specify country codes.

Android seems to be particularly sensitive about certificate domain suffixes. Ensure the suffixes match your expected configurations.

Country Code Consistency: The FreeRADIUS default may set the country code to FR. If your organization's certificate is registered under a different country code, adjust it accordingly; mismatches can cause failures in the authentication process.

Conclusion

This troubleshooting guide illustrates critical path steps to take when faced with EAP-TLS authentication challenges on Android 11 with FreeRADIUS. Adjusting network configurations—especially on firewalls—and ensuring certificate integrity can make a significant difference. So before you tear your hair out, give these strategies a try! With patience and attention to detail, you're sure to overcome these hurdles and establish a smooth EAP-TLS connection.

If you continue to run into issues, don’t hesitate to reach out to community forums or support for tailored advice. Good luck, and happy configuring!