Mission 164

Firewall service match

Compare firewall rules with service listeners.

Networking
8 minutes Advanced Lesson 164 of 360
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Lesson 164 of 360 0/360 lessons 0/17 missions Networking · 8 minutes
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Ops lab terminal Training lab
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learner@clairos:/home/learner $ Unix ops lab: type a command, press Enter
Instructions 8 minutes

Click any instruction for the command details, the why, and the common mistake to avoid.

Show firewall

Run ufw status verbose.

ufw status verbose
Show listeners

Run ss -tulpn.

ss -tulpn
Search port list

Run grep 443 /home/learner/data/ports.txt.

grep 443 /home/learner/data/ports.txt
Lesson support

What to notice while you play.

Objective

Compare firewall rules with service listeners.

Hint

Run the commands in order and compare the outputs.

Why it matters

Junior operators build confidence by gathering evidence before changing systems.

Common mistakes
  • Skipping the inspection step.
  • Assuming one command tells the whole story.
Reference

Commands in this lesson.

ss|ip

Inspect simulated sockets and addresses.

ssh|scp|ssh-keygen

Practice SSH inspection and dry-run transfer shapes without network access.

ufw status

Inspect simulated firewall rules.