EAP-MD5 Authentication Issues

Troubleshooting EAP-MD5 Authentication with wpa_supplicant

Abstract: Having trouble manually configuring EAP-MD5 authentication with wpa_supplicant? Learn how to identify and resolve common issues that may prevent successful EAP negotiation. Read more to find out how to overcome this tech support challenge.

Created: 2024-10-17 by

Introduction

This article aims to help users who are having trouble implementing EAP-MD5 authentication with the wpa_supplicant tool. EAP-MD5 is an authentication method that provides data confidentiality and integrity, but it is considered less secure than other methods such as PEAP or EAP-TLS. In this article, we will cover the key concepts of EAP-MD5 authentication and provide troubleshooting steps to help you get your wpa_supplicant configuration working.

Prerequisites

Before we dive into the troubleshooting steps, it is essential to ensure that you have the following prerequisites in place:

  • A wireless network that supports EAP-MD5 authentication.
  • A Linux system with wpa_supplicant installed.
  • Basic knowledge of Linux command line and network configuration.

Understanding EAP-MD5 Authentication

EAP-MD5 (Extensible Authentication Protocol-Message Digest 5) is a authentication method that uses MD5 hashing algorithm for data confidentiality and integrity. It is considered less secure than other methods such as PEAP or EAP-TLS due to its vulnerability to dictionary attacks and replay attacks. However, it is still used in some legacy networks.

Troubleshooting EAP-MD5 Authentication with wpa_supplicant

If you are unable to get EAP negotiation working with wpa_supplicant and are getting a successful association with the AP but unable to get the EAP negotiation, follow the steps below:

Step 1: Check wpa_supplicant Configuration

The first step is to check your wpa_supplicant configuration file. The configuration file is typically located at /etc/wpa_supplicant.conf. Open the file using a text editor and look for the following lines:

network={ ssid="" psk="" key_mgmt=WPA-EAP eap=PEAP TLS RADIUS identity="" }

Make sure that the SSID, password, identity, and key_mgmt are correct. Change the eap type to EAP-MD5 if you want to use EAP-MD5:

eap=MD5

Step 2: Check Network Interface

The next step is to check the network interface configuration. Make sure that the wireless interface is up and configured. Use the following command to check the interface status:

sudo iwconfig

Look for the wireless interface, usually wlan0, and make sure that it is up and configured:

wlan0 IEEE 802.11 ESSID:"" Nickname:"" Mode:Managed Frequency:2.412 GHz Access Point: Sensitivity:0/0 Signal level:0 dBm Noise level:0 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 TX Packets:105 TX Errors:0 TX Dropped:0 TX Collisions:0 Rx Packets:105 Rx Errors:0 Rx Dropped:0 Rx FIFO Errors:0 Rx Frame Errors:0 Rx Packets discarded:0

Step 3: Start wpa_supplicant

The next step is to start wpa_supplicant. Use the following command to start wpa_supplicant:

sudo wpa_supplicant -i wlan0 -c /etc/wpa_supplicant.conf

If wpa_supplicant starts successfully, you should see messages indicating that it is associating with the AP and negotiating EAP:

iwconfig wlan0 essid "" RSSI=-64 wpa_supplicant: wlan0: SME: Authenticating with wpa_supplicant: wlan0: WPA: Authenticating with wpa_supplicant: wlan0: WPA: Successfully authenticated with wpa_supplicant: wlan0: WPA: Association request to the AP succeeded wpa_supplicant: wlan0: WPA: GRASP requirement not met by peer wpa_supplicant: wlan0: WPA: Group Rekey activated wpa_supplicant: wlan0: WPA: Trying PTK/GTK key negotiation with wpa_supplicant: wlan0: WPA: PTK/GTK negotiation successful wpa_supplicant: wlan0: WPA: Key negotiation completed with [Long string of characters] wpa_supplicant: wlan0: WPA: Disassociated from wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed wpa_supplicant: wlan0: WPA: Association request to the AP failed 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Tags: tech support networking wpa_supplicant EAP-MD5

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Learn how to set up an Office PC Server with a Raspberry Pi using a Multihop SSH Tunnel Reverse Forward Tunnel. This guide will walk you through the process of connecting your home PC (192.168.1.42) to a Raspberry Pi and opening an SSH remote tunnel. Follow this tutorial to securely access your office server from home.

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Why does the mouse cursor trail on older Windows versions?
Why does the mouse cursor trail on older Windows versions?

Older versions of Windows sometimes cause the mouse cursor to trail, leaving copies of the cursor on the screen as it moves. This can be a problem when the computer is running slowly.

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Optimizing ChatGPT Web App Performance in Firefox
Optimizing ChatGPT Web App Performance in Firefox

This article provides tips and tricks to improve the performance of a ChatGPT web app in Firefox without losing functionality. Long conversations and slow typing input delays are common issues addressed in this article.

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Troubleshooting HDR Luminance Levels Mapping/Scaling while Playing HDR on PC
Troubleshooting HDR Luminance Levels Mapping/Scaling while Playing HDR on PC

This article provides solutions for issues encountered while playing downloaded HDR content on PC, such as incorrect luminance levels, mapping, or scaling. Common problems include games and YouTube not supporting HDR, even when setup is correct.

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Conditional Formatting: Chart Title Greyed
Conditional Formatting: Chart Title Greyed

This article explains how to use Conditional Formatting in a chart, but the chart title is greyed out. Here's how to resolve this issue...

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VeraCrypt Dual Boot Setup Disappears After Windows Reinstallation
VeraCrypt Dual Boot Setup Disappears After Windows Reinstallation

This article provides a solution for the issue where the VeraCrypt dual boot setup disappears after a Windows reinstallation.

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Options for Installing NVME PCIe Adapter on IBM System x3650 M3 Type 9745KPG
Options for Installing NVME PCIe Adapter on IBM System x3650 M3 Type 9745KPG

Recently purchased an old IBM System x3650 M3 Type 9745KPG without drives. Wanting to install an NVME PCIe adapter for read support. What are the options?

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Transparent Selection in Microsoft Paint Windows 11
Transparent Selection in Microsoft Paint Windows 11

Learn how to use the Transparent Selection option in Microsoft Paint Windows 11 for seamless image editing. Follow this guide to make your editing experience more efficient.

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Inspiron 155000 Black Screen Boot Loop
Inspiron 155000 Black Screen Boot Loop

A Dell Inspiron 155000 laptop is stuck in a boot loop while charging and downloading a file. The laptop returns 'Found laptop', and turning the charging lights blinks 3 amber and 1 white.

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Check Bitvise SSH Server License Validity Period on Windows 10
Check Bitvise SSH Server License Validity Period on Windows 10

Bitvise SSH Server license has expired and the server stops working, causing loss of access to remote computers. Check the current license validity date to plan ahead.

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Preserving Layers Saving in Microsoft Paint on Windows 11
Preserving Layers Saving in Microsoft Paint on Windows 11

Learn how to preserve layers when saving an image in Microsoft Paint on Windows 11 to avoid flattening and losing the ability to edit the image.

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Change Time Windows CMD Without Admin Rights
Change Time Windows CMD Without Admin Rights

Learn how to change the system time in Windows CMD without requiring admin rights using GitHub's Action Runner and Clock Sync.

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How to Transpose Rows/Columns in Notepad++ using Python Script Plugin
How to Transpose Rows/Columns in Notepad++ using Python Script Plugin

Learn how to transpose rows or columns in Notepad++ using the Python Script plugin. This article provides a step-by-step guide to install and use the plugin for efficient data manipulation.

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File Complaint Expedia
File Complaint Expedia

Learn how to file a complaint with Expedia. This guide covers steps for filing a complaint on Linux, Windows, and MacOS platforms.

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Unable to Connect Home Sky Broadband Network on Win10 Laptop: WiFi/Ethernet not valid IP configuration
Unable to Connect Home Sky Broadband Network on Win10 Laptop: WiFi/Ethernet not valid IP configuration

This article provides solutions for Win10 laptop users who are unable to connect their home Sky Broadband network due to the 'WiFi/Ethernet not valid IP configuration' error.

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Change Visited Link Color in Firefox (Latest Update: April 2025, v138.0)
Change Visited Link Color in Firefox (Latest Update: April 2025, v138.0)

Learn how to change the visited link color in Firefox with the latest update (April 2025, v138.0). This article provides step-by-step instructions to customize your Firefox browser.

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Resolved Dispute Expedia
Resolved Dispute Expedia

Learn how to resolve disputes with Expedia effectively. This article provides a step-by-step guide to help you through the process.

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Since upgrading to Windows 11, how to use Ctrl-Alt-Delete to login?
Since upgrading to Windows 11, how to use Ctrl-Alt-Delete to login?

After upgrading to Windows 11, the Ctrl-Alt-Delete key combination no longer brings up the prompt to enter a PIN (logging into Windows). No indication is given when the keys are pressed.

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Cron Won't Start VirtualBox VM: A Solution
Cron Won't Start VirtualBox VM: A Solution

In this article, we will discuss a solution to a common issue where Cron won't start a VirtualBox VM. This problem can occur on various operating systems, and we will provide a solution that should work across Linux, Windows, and MacOS.

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Block Internet Access for VLAN using EdgeRouter X5
Block Internet Access for VLAN using EdgeRouter X5

This article will guide you on how to block Internet access for a VLAN using EdgeRouter X5. By the end of this article, you will learn how to isolate your printer from the Internet while connected to a specific VLAN.

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Export Command Line Column Task Manager Data to CSV
Export Command Line Column Task Manager Data to CSV

Learn how to export the Task Manager's memory usage data to a CSV file using the command line. This guide covers Windows, Linux, and macOS.

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Configuring OS/Browser to Open Certain File Extensions in Specific Websites (Browser-Specific) - Tech Support
Configuring OS/Browser to Open Certain File Extensions in Specific Websites (Browser-Specific) - Tech Support

Learn how to configure your operating system and browser to open specific file extensions in certain websites, making it easier to handle old computers and access modern web applications.

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Recommendation for Weird/Big Multi-Monitor KVM Setup
Recommendation for Weird/Big Multi-Monitor KVM Setup

This article provides a recommendation for a weird/big multi-monitor KVM setup using a Thunderbolt port and drive. It will guide you through the process of setting up a desktop replacement with six screens, ensuring a seamless and efficient work environment.

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Running rsync on Windows using MSYS2: Source/Dest Path Formats
Running rsync on Windows using MSYS2: Source/Dest Path Formats

This article provides instructions on how to use rsync on Windows with MSYS2, converting Windows source/dest paths to a Linux-compatible format. This allows syncing through rsync.

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Automating Keyboard Shortcuts with PowerShell and Task Scheduler
Automating Keyboard Shortcuts with PowerShell and Task Scheduler

Learn how to automate keyboard shortcuts using PowerShell and Task Scheduler. This guide will show you how to create and schedule a PowerShell script that sends specific keystrokes to open applications.

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Splitting Multiline Text Words - PowerShell
Splitting Multiline Text Words - PowerShell

Learn how to split multiline text words using PowerShell. This article provides a simple solution to the problem of splitting text at specific characters, even when they are followed by whitespace. Try the provided script to effortlessly split your multiline text.

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Creating a User-Defined Snippets Repository in Kate
Creating a User-Defined Snippets Repository in Kate

This article provides a step-by-step guide on creating and setting up a user-defined snippets repository in Kate, a powerful and feature-rich text editor. Follow these instructions to streamline your coding experience.

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Creating a Spreadsheet List with Addresses and Tickbox for Payment Received
Creating a Spreadsheet List with Addresses and Tickbox for Payment Received

Learn how to create a spreadsheet list with addresses and a tickbox for payment received. This tutorial will guide you step-by-step to organize your data effectively.

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