Check SSH Status on Ubuntu | Generated by AI

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Question: How can I check whether the SSH service is running/open on my Ubuntu system?

Answer:

Here are the most reliable and commonly used ways to check if SSH (usually OpenSSH server) is running and listening on your Ubuntu machine (2024–2026 editions):

Quickest & Recommended Methods

1. Check service status (most recommended)

sudo systemctl status ssh

or

systemctl status ssh

Look for these key lines:

• Active: active (running) → SSH is running
• Active: inactive (dead) → SSH is stopped
• Active: failed → SSH failed to start (look at the error below)

Alias note: on Ubuntu the service is usually called ssh (not sshd)

1. Even shorter – just check if it’s active

systemctl is-active ssh

Output:

• active → running
• inactive → stopped
• failed → crashed

1. Check if SSH port is listening (very reliable)

# Most popular & clean way (recommended)
ss -tuln | grep :22

# Alternative commands (all work)
sudo netstat -tuln | grep :22
sudo lsof -i :22
sudo ss -tuln  | grep ':22.*LISTEN'

If you see output similar to this → SSH is listening:

tcp   LISTEN 0      128          0.0.0.0:22        0.0.0.0:*
# or
tcp   LISTEN 0      128             [::]:22           [::]:*

No output → SSH is not listening (either not installed or not running)

One-line “am I reachable via SSH right now?” checks

# Method A - very clear
sudo systemctl is-active --quiet ssh && echo "SSH is RUNNING" || echo "SSH is STOPPED"

# Method B - port check style
ss -tuln | grep -q ':22 ' && echo "Port 22 is OPEN" || echo "Port 22 is CLOSED"

Summary – fastest commands to remember

Command	What it tells you	Recommendation
systemctl is-active ssh	Running or not	★★★ best daily check
ss -tuln \| grep :22	Actually listening on port 22	★★★ very trustworthy
sudo systemctl status ssh	Full status + recent logs	Best when something is wrong

Bonus – If you want to see from outside

Run this from another computer:

# Replace 192.168.1.100 with your Ubuntu machine's IP
nc -zv 192.168.1.100 22

Output:

• succeeded! → SSH port is open and reachable
• Connection refused / timeout → SSH is off, firewalled, or network issue

Pick whichever style you like most — most Ubuntu users just use:

systemctl is-active ssh && ss -tuln | grep -q :22 && echo "SSH looks good ✓" || echo "SSH has problem ✗"

References:

• None needed (standard Ubuntu commands, valid in 2024–2026)

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