Run ss -tulpn.
ss -tulpn
Mission 95
Exposed services
Compare listeners, firewall rules, and nginx config.
Security administrationssufwgrep
Lesson 95 of 360
0/360 lessons
0/17 missions
Security administration · 8 minutes
New learnerrank
0XP
0%complete
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.
Run ufw status.
ufw status
Run grep listen /etc/nginx/sites-available/learn.conf.
grep listen /etc/nginx/sites-available/learn.conf
Save progress
Keep learning across sessions.
Create a free account to sync completed lessons, XP, streaks, course status, and your next lesson across sessions.
Checking account status...
Progress sync is idle.
0XP
New learnerrank
0day streak
0best streak
0daily streak
0lessons
0courses
0missions
0tasks
Noverified
Progress sync stores completion IDs, scores, streaks, badges, and game settings. Terminal contents, editor snippets, lab scratch, email, and real names are never published on leaderboards or share cards.
Lesson support
What to notice while you play.
Inspect service exposure from multiple angles.
Run ss, ufw status, then grep listen.
Security reviews need both network and config evidence.
- Only checking the firewall.
- Only checking the process list.
Reference
Commands in this lesson.
grep [-i] <text> <file>
Find literal text inside a file.
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.