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Security
Guides and tutorials in this category.
Articles
How to Secure Nginx with Let's Encrypt SSL (Certbot) and Auto-Renewal
To secure Nginx with a free Let's Encrypt certificate, install Certbot from snap and run sudo certbot --nginx -d...
How to Set Up a Firewall (UFW) and Fail2Ban on Ubuntu
To secure an Ubuntu server, enable UFW and Fail2Ban together. Set UFW to deny all incoming traffic by default and...
My IP Was Blocked by the Server Firewall: How to Get Unblocked (CSF/LFD and Fail2Ban)
If your website, cPanel, SSH and email all time out from one connection while they work from another, the server...
My Website Was Hacked: What to Do Step by Step (Malware Cleanup and Imunify360)
If your website was hacked, work in this order: lock the attacker out by changing every password, take the site...
SSL Certificate Errors: "Not Secure", Mixed Content, Expired Certificates and OCSP Problems
A "Not Secure" warning means the browser does not fully trust the HTTPS connection. The cause is one of four things:...
Why Your Emails Land in Spam (and How SPF, DKIM, DMARC and PTR Fix It)
Your emails land in spam because receiving servers such as Gmail and Outlook.com cannot confirm that your server is...
Essential Server Security Hardening for Ubuntu
A few basic steps dramatically reduce your server’s attack surface. Apply these right after provisioning.1....
How to Set Up SSH Key-Based Authentication
SSH keys are far more secure than passwords. This guide sets up key-based login and disables password...
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