Infrastructure, explained
How DNS, domains, certificates and monitoring actually work — and what to check first when they don’t. No vendor pitches, no listicles.
Earlier articles — Page 2
Monitoring & StatusSep 21, 2026 · 5 min read
How often should you monitor your website?
The right check interval depends on your SLA and the cost of missed downtime, not a default. Here's the math to pick yours.
Servers & CloudSep 18, 2026 · 6 min read
Cloud firewall rules explained: default-deny, inbound/outbound and common mistakes
A practical breakdown of how cloud firewall rules actually work, why default-deny matters, and the ports people leave open without realising it.
Domains & DNSSep 14, 2026 · 5 min read
Reverse DNS explained: PTR records and why mail servers need them
Reverse DNS maps an IP address back to a hostname using PTR records. Here's how it works, why mail servers check it, and how to set it up.
Email & deliverabilitySep 11, 2026 · 5 min read
SPF record too many lookups: how to fix the 10-lookup limit
Your SPF record fails with "too many DNS lookups" once it exceeds 10 mechanism lookups — here's why it happens and how to flatten or consolidate it safely.
Monitoring & StatusSep 9, 2026 · 5 min read
Infrastructure drift explained: what it is and how it creeps in
Infrastructure drift is the gap between what your config says and what's actually running. Here's how it happens, how tools detect it, and how to stay ahead of it.
Servers & CloudSep 7, 2026 · 6 min read
IPv4 vs IPv6 explained: differences, dual-stack, and why it matters
A practical comparison of IPv4 and IPv6 addressing, headers, and NAT — plus what dual-stack means for the servers you run today.
Monitoring & StatusSep 4, 2026 · 5 min read
What is synthetic monitoring? Scripted checks vs real users explained
Synthetic monitoring runs scripted checks against your site or API on a schedule, catching outages before real visitors do. Here's how it works and when to use it.
Certificates & SSLSep 2, 2026 · 6 min read
Certificate transparency explained: what CT logs are and why they matter
Certificate Transparency logs make certificate issuance public and auditable. Here's how CT works and how to use it to catch misissued certificates early.
Email & deliverabilityAug 26, 2026 · 5 min read
Why your emails go to spam (and how to fix it)
Emails land in spam because of broken authentication, poor sender reputation, or content that trips filters — here's how to diagnose and fix each one.
Domains & DNSAug 21, 2026 · 6 min read
What is DNSSEC and should you enable it?
DNSSEC stops attackers from forging DNS answers, but it's opt-in everywhere and easy to misconfigure. Here's the threat it solves, the trade-offs, and when to turn it on.
Email & deliverabilityAug 19, 2026 · 7 min read
MX record not working: how to diagnose and fix broken mail routing
A step-by-step guide to diagnosing why your MX record isn't routing mail, covering priorities, trailing dots, CNAME targets and stale records.
Servers & CloudAug 17, 2026 · 5 min read
How to secure your infrastructure in 2026: a practical checklist
A practitioner's checklist for securing DNS, TLS, servers and monitoring in 2026 — covering zero trust, DNSSEC, certificate automation and supply chain hygiene.
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