Troubleshooting Guide for TACACS+ Authentication Failures on Omada Switches

Contents

Objective

Requirements

Introduction

Troubleshooting Steps

Conclusion

Objective

If you encounter the issue of devices being unable to authenticate successfully after configuring the TACACS+ feature on the Omada Switch, you can follow the troubleshooting steps below to resolve the problem.

Requirements

• Omada Smart, L2+ and L3 switches
• Omada Controller (Software Controller / Hardware Controller / Cloud Based Controller, V5.9 and above)

Introduction

To enhance network security, you can configure TACACS+ authentication to restrict client access to the switch through the SSH protocol or Console interface.

Troubleshooting Steps

Step 1. Check the network connectivity.

Ensure the network link between the switch and the TACACS+ Server is normal, and also ensure that the authentication port (usually 49, but there are exceptions) is enabled by the TACACS+ Server.

Step 2. Check that the username and password used for authentication are correct.

Step 3. Check the configurations of TACACS+ Server and AAA.

Go to Tools > Terminal, select Switch as the Device Type, select the switch that has TACACS+ configured, and then click Open Terminal.

Use the following command to view information about the configuration:

Switch>en

Switch#show run

Find the following configuration information related to TACACS+ Server and AAA. Make sure that the IP address, port number, and key of the TACACS+ Server are correct. "test" is a custom login method that specifies TACACS+ authentication as the first priority.

Find the following configuration information and make sure that the authentication method for SSH/Console login is specified as “test”.

Note: The switch is not accessible using telnet after being adopted by Contrller.

Step 4. Check if ACL, IMPB, MAC Filtering, or other security policies are configured.

Conclusion

We have now completed the troubleshooting of TACACS+ authentication failure.

To learn more about each function and configuration, please visit Support Home to download or check the manual for your product.