Knowledge base category
Firewall and Security
104 practical guides in Firewall and Security.
How to Find Services That Need a Restart After Updates with needrestart
Find services using outdated libraries with needrestart on Ubuntu. Read restart reports, review automatic restart policy and plan maintenance safely.
Firewall and SecurityHow to Connect Two Servers Privately with WireGuard
Connect two servers with WireGuard and keep PostgreSQL on the tunnel. Verify peer traffic, private database access and denied public connections.
Firewall and SecurityInterServer HIPAA Hosting: BAA and Shared Responsibilities
Review InterServer HIPAA hosting responsibilities and download the BAA and provisioning checklist. Request service-specific coverage through a support ticket.
Firewall and SecurityHow to Sign and Verify Files with Minisign
Sign release files with Minisign, share an authenticated public key, verify downloads, and stop processing when signatures fail.
Firewall and SecurityHow to Restrict Redis Access with ACLs
Restrict Redis users to selected commands and key prefixes on Ubuntu. Verify authentication, denied requests, and ACL persistence after restart.
Firewall and SecurityHow to Configure UFW Firewall for Docker Containers
Keep Docker web containers behind a host reverse proxy so UFW controls public access. Includes tested port bindings, firewall rules, and external checks.
Firewall and SecurityAPI Security 101: Rate Limiting, Keys, and OAuth2 for Small Teams
API security for small teams in 2026: rate limiting strategies, API key best practices, when you actually need OAuth2, and a priority order for building it all out.
Firewall and SecurityLinux iptables: The Firewall That Actually Runs Under Your VPS
Learn iptables from the ground up. How Linux netfilter works, how to read rules, and how to configure a secure VPS firewall with direct iptables commands.
Firewall and SecurityVPS Security Checklist: 12 Things to Do Right After Server Setup
12 essential security steps after provisioning a VPS. SSH keys, firewall, Fail2Ban, automatic updates, and more. A checklist that takes under an hour.
Firewall and SecurityHardening Your cPanel Server: Beyond the Basics After CVE-2026-41940
Security is a moving target. With the recent discovery of CVE-2026-41940, it has become clear that just having a firewall isn't enough anymore.
Firewall and SecurityThe dangers of shared licenses (in other words unofficial/cracked licenses)
Why Cracked cPanel Licenses Aren’t Worth the Risk: A Guide for InterServer Customers When you’re managing a server, every dollar counts.
Firewall and SecurityHow to Generate and Verify Files with MD5 Checksum in Linux
Learn how to generate and verify MD5 checksums in Linux to validate downloads, backups, and files. Includes real examples, troubleshooting, and SHA alternatives.