What Is DNSSEC and Should We Enable It?
If your site goes down after enabling DNSSEC or resolvers stop responding, the problem is usually an expired signature. A practical guide to diagnosis and fixing.
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Practical articles on hosting, servers, security, SEO and online business — in plain, useful language.
Email Deliverability Audit: Why Do Emails Go to Spam?
Are transactional emails going to spam? With an email deliverability audit, examine DNS records, domain warm-up, and reading the header of a rejected email step by step.
Read moreA Guide to Reading DMARC Reports and Detecting Sender Spoofing
How to read a raw DMARC report, separate authorized senders from spoofed ones, and figure out when you can enable the p=reject policy.
Read moreCNAME or A; Which DNS Record to Put Where
If you put a CNAME record on the domain root and the site didn't come up, the problem isn't DNS; it's the standard. See the correct way.
Read moreHow Long Does DNS Propagation Take? The Truth About TTL and Caching
If you still see the old site after changing a DNS record, the problem is usually TTL and caching, not a 48-hour wait. Here's exactly how to make propagation take just minutes.
Read moreWhat Is a DNS Record? A Complete Guide to Record Types with Examples
If your site won't load or email won't send, the problem is usually a wrong DNS record. Here you'll see the exact syntax of A, AAAA, CNAME, MX, TXT, SRV, and CAA with real examples.
Read moreHow Do We Root-Cause Site Outages?
Find short and irregular site outages with external monitoring, log correlation, and cron; a practical guide for site administrators.
Read moreSite Hacked? Do These Things First
If your site is hacked, the first step is cutting off the attacker's access, not deleting files. This guide explains step by step the correct order of containment, preserving evidence, cleanup, and restoring the site.
Read moreServer Error Log: Finding Errors Without Getting Lost
When a site throws an error, the first thing to do is find the server error log. This guide shows where to look, how to trace a specific request, and how to keep error_log separate from access_log.
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