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Reverse DNS — the PTR record — is the lookup that maps an IP address back to a hostname. It's the inverse of the…
Let's Encrypt is a free, automated, browser-trusted certificate authority. Three things are needed: a domain pointing…
Sending mail from a VPS in 2026 is harder than it used to be — not because the protocols changed, but because every…
Three reverse proxies cover the vast majority of practical deployments in 2026. Each is best at something specific.…
The standard Let's Encrypt flow uses HTTP-01: certbot serves a challenge on port 80, the CA fetches it, cert issued.…
An IP that ends up on a public blocklist hurts in different ways depending on what you use the VPS for: outbound…
WireGuard is the cleanest way to connect two VPSes — or two sites — over an encrypted tunnel. Configuration is a…
IPv4 is exhausted; IPv6 has been ready for decades. Yet the internet remains stubbornly dual-stack because some…
UFW is great for "open SSH, open HTTPS, close everything else." When you need more control — per-source-IP rate…
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