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Troubleshooting AWS Network Connectivity: Security Groups and NACLs

Troubleshooting basic network connectivity issues is an important skill. This troubleshooting scenario is an opportunity to assess your skills in this area. In this lab scenario, a junior administrator has deployed a VPC and instances, but there are a few things wrong. `Instance3` is not able to connect to the internet and the junior admin can't determine why. Being a senior administrator, it's your responsibility to troubleshoot the issue and ensure the instance has connectivity to the internet, so that you can ping and log in to the instance using SSH.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 1h 0m
Last updated
Clock icon Sep 03, 2025

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Table of Contents

  1. Challenge

    Determine Why the Instance Cannot Connect to the Internet

    1. Troubleshoot connectivity for Instance3 and resolve the issue. You can use ping tests from either your local PC or you can ssh into Instance 1 to do the ping tests for the lab.

  2. Challenge

    Identify the Issues Preventing the Instance from Connecting to the Internet

    1. Identify and fix the issues that are preventing the instance from connecting to the Internet.

    2. Once they're resolved, connect to the instance using SSH to verify connectivity. Use the cloud_user username and the password identified on the lab credentials page to login:

      ssh cloud_user@<PUBLIC_IP_ADDRESS>
Pluralsight Skills - Labs - Pluralsight
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Pluralsight Skills

Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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Follow along with the author’s guided walkthrough and build something new in your provided environment!

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On average, you retain 75% more of your learning if you get time for practice.
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