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Labs

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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Lab platform
Lab Info
Level
Advanced
Last updated
Sep 23, 2025
Duration
1h 30m

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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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