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Troubleshooting network issues

In this exercise, you will need to troubleshoot and resolve connectivity issues to a web server. *This course is not approved or sponsored by Red Hat.*

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Labs

Path Info

Level
Clock icon Advanced
Duration
Clock icon 1h 30m
Last updated
Clock icon Aug 29, 2025

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Table of Contents

  1. Challenge

    Verify Server1.

    Verify Server1 is running Apache:

    systemctl status httpd

    Verify Apache is listening on port 80:

    ss -lntp | grep 80

    Verify the content can be accessed locally:

    curl localhost

    Verify the firewall is permitting port 80 traffic:

    firewall-cmd --list-all

    Permit inbound traffic to Apache:

    firewall-cmd --permanent --add-service=http

    Reload the firewall to pickup the change:

    firewall-cmd --reload

  2. Challenge

    Verify Server2.

    On Server2 (10.0.1.11)

    Attempt to pull the web content from Server1 via hostname:

    curl ip-10-0-1-10.ec2.internal

    Attempt to pull the web content from Server1 via IP

    curl 10.0.1.10

    Check to see what DNS hosts are being used:

    cat /etc/resolv.conf

    Verify resolution via the specified host:

    dig @10.0.0.2 ip-10-0-1-10.ec2.internal

    Verify /etc/nsswitch.conf:

    vim /etc/nsswitch.conf

    Attempt to pull the web content from Server1 via hostname:

    curl ip-10-0-1-10.ec2.internal

    Ping ip-10-0-1-10.ec2.internal:

    ping ip-10-0-1-10.ec2.internal

    Review /etc/hosts:

    vim /etc/hosts

    Attempt to pull the web content from Server1 via hostname:

    curl ip-10-0-1-10.ec2.internal

    Install elinks:

    yum install -y elinks

    Use elinks to view the content:

    links -dump http://ip-10-0-1-10.ec2.internal
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