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Firewall Troubleshooting

In this learning activity, there is a fairly simple, but broken, firewall configuration. The firewall on `Server1` (10.0.1.10) should be configured to permit web requests from `Client1` (10.0.1.11). You will need to determine why the firewall isn't working as intended, and resolve the issue.

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Lab platform
Lab Info
Level
Intermediate
Last updated
Sep 19, 2025
Duration
30m

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Table of Contents
  1. Challenge

    Verify That the Issue Exists

    Prior to beginning the troubleshooting, you should verify that the issue actually exists.

    Attempt to curl the headers for 10.0.1.10 from 10.0.1.11:

    $ curl -I 10.0.1.10

  2. Challenge

    Resolve the Problem by Creating a New Zone

    You can resolve this issue by creating a new zone, adding the http service to it, and designating 10.0.1.11 as a source for the zone. Use these commands:

    [root@$host ~]# firewall-cmd --permanent --new-zone=api
    [root@$host ~]# firewall-cmd --reload
    [root@$host ~]# firewall-cmd --permanent --zone=api --add-service=http
    [root@$host ~]# firewall-cmd --permanent --zone=api --add-source=10.0.1.11
    [root@$host ~]# firewall-cmd --reload
    
  3. Challenge

    Verify That the Problem Is Resolved

    From Client1 (10.0.1.11), run:

    curl -I 10.0.1.10

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