DEV Community

Arthur Kirby
Arthur Kirby

Posted on

I Thought My System Was Secure… Until I Found This One Mistake

I used to think my system was secure.

Not “enterprise-grade security team” secure.

But definitely:

👉 “I know what I’m doing” secure.

Strong passwords? ✅
Firewall enabled? ✅
Antivirus installed? ✅

I mean… what could possibly go wrong?

😌 The Confidence Phase

Like many developers, I believed security was something like:

“If nothing bad has happened yet, I must be doing it right.”

And honestly?

For a while… that seemed true.

No breaches.
No alerts.
No weird activity.

Just peaceful ignorance.

🧪 The Curiosity That Started It All

One day, out of pure curiosity, I decided to run a basic security check on my own setup.

Nothing fancy.

Just:

Reviewing open ports

Checking running services

Looking at logs

You know… the stuff we all say we do regularly.

😐 The Moment Everything Changed

That’s when I saw it.

An open port.

Not just any port.

👉 A port that should NOT have been open.

At first, I thought:

“That’s probably nothing.”

(Yes… I was still in denial.)

🔍 Digging Deeper

I checked what was running behind that port.

And there it was:

👉 A service I had installed weeks ago… and completely forgotten about.

No restrictions.
No proper configuration.
Accessible from outside.

Basically:

👉 An open door with a welcome sign.

😳 Why This Was Dangerous

Here’s the scary part:

That service:

Had weak default settings

Was not updated

Didn’t log access properly

Which means:
👉 If someone found it… I wouldn’t even know.

Let that sink in.

🤦 The Real Mistake

The issue wasn’t just the open port.

It was this:

👉 I assumed “installed = secure.”

But in cybersecurity, that’s completely wrong.

Installed means:
👉 Potentially exposed.

🛠️ What I Did Immediately

Panic? A little.

But mostly action.

Here’s what I did:

  1. Closed unnecessary ports

If it didn’t need to be public:

👉 It was shut down.

  1. Removed unused services

If I wasn’t actively using it:

👉 It was gone.

No “maybe later.”

  1. Updated everything

Outdated software is basically an invitation.

So I:

Updated all services

Patched known vulnerabilities

  1. Added proper monitoring

No more blind spots.

Now:

Logs are enabled

Alerts are configured

  1. Changed my mindset

This was the biggest shift.

I stopped thinking:

“Am I secure?”

And started asking:

👉 “What am I missing?”

🧠 What This Taught Me

  1. Security is not a one-time setup

It’s ongoing.

Always.

  1. Forgotten things are the most dangerous

Old scripts. Old services. Old configs.

👉 They don’t disappear—they become risks.

  1. Silence does NOT mean safety

No alerts ≠ no problems

  1. Basic checks go a long way

You don’t need advanced tools to find real issues.

Just awareness.

⚠️ A Simple Checklist (You Should Do This Today)

If you’re reading this, take 10 minutes and check:

What ports are open?

What services are running?

What did you install and forget?

What hasn’t been updated?

You might be surprised.

Or uncomfortable.

Probably both.

🚀 Final Thought

I didn’t get hacked.

But I easily could have been.

And honestly?

👉 That’s worse.

Because it means the only thing protecting me…

was luck.

👇 What about you?

Have you ever found a security issue by accident?

Do you regularly check your own setup?

Let’s talk 👇

Top comments (0)