Hey Ala,

Imagine you’re trying to expose an app to the internet and every connection times out.

Everything seems right, and there are no error messages. It should work!

What would you do next?

That’s where Tobias, one of my KubeCraft students, found himself last week.

After joining one of the mentorship calls we host 3x/week, he went back in with a plan.

He read the logs line by line. He ran manual TCP and UDP connection tests from the command line.

Eventually he traced the issue to his router’s firewall silently blocking outbound traffic on a non-standard port.

Then something strange happened.

He toggled the firewall back to its default setting — and the connection kept working.

The exact rule that had blocked it minutes before no longer mattered.

He posted his full investigation in our community, and I was able to confirm he’d nailed the root cause.

The missing piece: the protocol had fallen back to an existing session over port 443, which is why it survived the restrictive firewall.

The initial connection needed that non-standard port. But once established, the session persisted through a standard encrypted channel.

Be honest with yourself — would you have found that?

Most people wouldn’t. Not because they’re not smart enough, but because nobody ever taught them to investigate at this level.

This is what it actually looks like to debug infrastructure.

Reading logs, tracing network paths, understanding protocol behavior — all from the command line, no ChatGPT.

And here’s the uncomfortable truth.

No 12-week bootcamp teaches this. One week of Linux and one week of programming will not prepare you to troubleshoot a production system where a firewall rule silently drops traffic on a port you didn’t even know you needed.

That kind of skill comes from building real infrastructure with your own hands. Breaking it. Investigating why it broke.

And having someone in the room who’s done it before and can point you at the piece you’re missing — like Tobias had.

Collecting certificates and stacking Udemy completions is CV decoration.

Companies don’t hire decorators. They hire people who can find the firewall rule nobody else would have checked.

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Honor thy craft,

Mischa

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P.S. If you want to build the kind of deep troubleshooting skills that actually get you hired, book a career strategy call with my team. We’ll look at where you are right now and tell you exactly what’s between you and a remote six-figure DevOps role.

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