Rafael Gómez

Network & Security Engineer

Tutorials, guides and opinions on IT, networking, security and automation

The same phishing email, two verdicts: one quarantined, one delivered. Why MFA does not protect against device code phishing, and which control…

September 10, 2026 · 19 min read

UniFi Access fails with a mariadb-common 404 and retries in a loop. Why apt-get update and firmware updates don't fix it, and…

September 6, 2026 · 9 min read

I installed Passbolt, broke it on purpose and rebuilt it clean. Every command and every terminal output here was actually run: the…

August 29, 2026 · 50 min read

Why a self-hosted mail server does not deliver, and how to connect SMTP2GO free of charge with click tracking switched off. All…

August 15, 2026 · 27 min read

How an entropy bug sat hidden for five years inside one of Bitcoin’s most respected hardware wallets, and let attackers steal funds…

August 5, 2026 · 64 min read

72 commits in four days, a measurably better site, and four things broken, one of them in production. What failed, what saved…

August 4, 2026 · 8 min read

The same phishing email, two verdicts: one quarantined, one delivered. Why MFA does not protect against device code phishing, and which control…

September 10, 2026 · 19 min read

UniFi Access fails with a mariadb-common 404 and retries in a loop. Why apt-get update and firmware updates don't fix it, and…

September 6, 2026 · 9 min read

I installed Passbolt, broke it on purpose and rebuilt it clean. Every command and every terminal output here was actually run: the…

August 29, 2026 · 50 min read

Being an immigrant and starting a career in technology is hard, but not impossible. I share my own experience and practical advice…

November 9, 2024 · 4 min read

Getting started in IT can be daunting, and picking your first certification is key to opening doors. In this post I share…

November 9, 2024 · 6 min read