The second part of the tutorial covers different ways of integrating port knocking into the two most popular SSH clients, OpenSSH and PuTTY, under Linux and Windows respectively, which automates port knocking during connection establishment.

Port knocking can be used to hide services that are particularly interesting for attackers. This first part of a multi-part tutorial shows which variants exist and how easy it is to implement credential port knocking using nftables or iptables directly in the Linux kernel firewall.

Since HomeAssistant 2024.7, the weather data provider integration OpenWeatherMap no longer provides forecast data as sensor entities. This mini-tutorial shows how to continue providing the sensor entities using templates with periodical service calls.

OpenSSL 3.0 removed numerous algorithms that were considered outdated or unsafe. But some software still relies on these algorithms. This mini tutorial shows you how to reactivate them.