Troubleshooting Amazon EC2 Network Connectivity

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Troubleshooting Amazon EC2 Network Connectivity

The goal of this hands-on lab is to fix the broken environment and achieve the goal as outlined below. The first video in this lab presents the scenario and the goal, while the second video provides the solution (if needed). Do your best to solve the connectivity issue without viewing the solution video. **Goal:** Fix the connectivity issue in the AWS environment so that you can update the `yum` package installer (from the command line) on the provided EC2 instance (named "web server"). This environment has been created with security in mind, so the "web server" EC2 instance has been provisioned in a private subnet and placed behind a bastion host and NAT gateway.

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Lab Info

Level

Intermediate

Last updated

Sep 23, 2025

Duration

1h 0m

Challenge

Fix SSH Ingress to Bastion Host

The Issue

SSH traffic is being denied by the security group associated with the bastion host.

How to Fix the Issue

Add an SSH (port 22) allow rule to the security group associated with the bastion host.
Challenge

Fix Egress from Web Server to Internet

The Issue

The NACL protecting the web server only allows return traffic to the public subnet, not the internet.

How to Fix the Issue

Add an outbound "all traffic" allow rule to 0.0.0.0/0 to the NACL.
Challenge

Fix Web Server Route to Internet

The Issue

The web server does not have a route to the NAT gateway.

How to Fix the Issue

Add a route to the NAT gateway on the route table associated with the private subnet the web server is located in.

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