Protect your SSH port with FirewallD and Knockd on CentOS 7 Linux

This article will explain how to hide your SSH daemon from port scanners and attackers on CeonOS 7 Linux by using FirewallD with KnockD (port knocking daemon).   What does knockd? Port knocking server is a daemon running on the server and waiting for a specific port knocking sequence. Such a sequence usually consists of… Read More »

How to get a free SSL certificate for your website

Save money by installing a free SSL certificate on your domain. Since October 2017, Google has decided that an SSL certificate is required for each website. As of January 2018, Google will penalize websites that do not have a valid SSL certificate installed. The first sanction will be a huge red warning page within Google’s… Read More »

Repair Corrupted and Undetectable USB Flash Drive

How to repair unreadable USB Flash Drive when Windows cannot recognize the USB Drive (Please insert a disk into Removable Disk). For a variety of reasons, a USB Flash Drive can get damaged and become undetectable by Windows or any other OS. If a USB memory stick is no more accessible by the actual operating… Read More »