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Theory and guides

🏠 CyberSet › Posts › Theory and guides
DNS_PROBE_FINISHED_NXDOMAIN Chrome error: how to fix NXDOMAIN, check whois domain and dig. DNS resolution diagnostic tools and Windows cache fix
🕒 Reading time: 5 min
Posted inFor experienced Protocols and infrastructure Step-by-step instructions

DNS_PROBE_FINISHED_NXDOMAIN: What is this error and how can it be fixed?

DNS_PROBE_FINISHED_NXDOMAIN is one of the most common DNS errors in Chrome, which makes websites unavailable to a significant portion of Windows users in Ukraine. In this article, we will look…
26.01.2026
A dynamic cyberattack on the Telegram app featuring images of hacker icons, a broken lock, and protective shields in a digital network.
🕒 Reading time: 7 min
Posted inDevice protection For beginners Privacy

What to do if your Telegram account has been hacked: step-by-step instructions

If your Telegram account has been hacked, the main thing is not to panic, but to quickly take a few clear steps, preferably within the first 24 hours. This will…
19.01.2026
Illustration of cybersecurity with a lock and several accounts, showing the danger of using one password for all accounts
🕒 Reading time: 10 min
Posted inChecklists and cheat sheets Cybersecurity basics For beginners

Why shouldn't you use the same password for all your accounts?

Do you use the same password for all your accounts? Then you are walking on the edge of a precipice. If this password is the same for email, social networks,…
16.01.2026
Повний посібник із безпеки WordPress 2025: захистіть свій сайт, зображення із замком, ключем, попередженням та іконками безпеки навколо логотипу WordPress.
🕒 Reading time: 5 min
Posted inChecklists and cheat sheets For experienced Penetration testing and CTF

Ultimate WordPress Security Guide: Protect Your Site in 2025

WordPress powers over 40% of all websites worldwide, making it a prime target for hackers and cybercriminals. From small blogs to large e-commerce platforms, vulnerabilities in your WordPress site can…
22.08.2025
QR code for Wi-Fi: creation and security
🕒 Reading time: 3 min
Posted inStep-by-step instructions Theory and guides Trends and future

QR Code for Wi-Fi: Creation and Security

In the modern world, we strive to make our lives easier and more convenient. One of the tools that help us do this is QR codes. They are widely used…
07.09.2024
Hashcat: Using and configuring it
🕒 Reading time: 3 min
Posted inFor beginners Simple cryptography Step-by-step instructions

Hashcat: Using and configuring it

Hashcat is a powerful password recovery tool that supports a wide range of hashing algorithms and uses brute-force and dictionary attacks. Thanks to its flexible options and the ability to…
03.09.2024
Network utilities: Ping, Traceroute, WHOIS, Dig
🕒 Reading time: 4 min
Posted inChecklists and cheat sheets For beginners For experienced

Network utilities: Ping, Traceroute, WHOIS, Dig

Network utilities are an important part of the toolkit for both system administrators and users who want to understand the state of their network. Let's take a closer look at…
22.08.2024
Nmap: What is it and how to use it?
🕒 Reading time: 5 min
Posted inChecklists and cheat sheets For beginners For experienced

Nmap: What is it and how to use it?

In the ever-changing cybersecurity landscape, it's important to have tools at your disposal to help you assess your network's security and identify potential vulnerabilities. One such tool in particular is…
15.08.2024
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