DNS Cache: Why Record Changes Don't Show Up and How to Flush It
You've changed the DNS record but the site still loads the old version? Get to know each DNS cache layer one by one and learn how to flush each one.
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Practical articles on hosting, servers, security, SEO and online business — in plain, useful language.
PTR Record: Why Your Email Server Is Being Rejected
If your server's emails are going to spam or being rejected with a 550 error, the problem is likely a missing PTR record. Here you'll see who sets it and how.
Read moreSubdomains: Creation, SSL, and the Danger of Abandoned Ones
How to create a subdomain, why SSL and wildcard records go wrong here, and how an abandoned subdomain leads to compromise.
Read moreNameservers: Choosing Between Host, Registrar, or Cloud
If your site stumbles on the registrar's nameservers, this guide shows the criteria for choosing between host, registrar, and cloud DNS — with numbers and commands.
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 moreDNS_PROBE_FINISHED_NXDOMAIN Error; Diagnose and Fix in 10 Minutes
Browser says DNS_PROBE_FINISHED_NXDOMAIN? Use dig, whois, and nslookup to find the root of the DNS error: expired domain, wrong nameserver, or local cache.
Read moreHTTP Status Codes: A Practical Guide to Common Errors
Interpret HTTP status codes correctly: the difference between 301 and 302, why 403 differs from 401, and why 503 is usually not your server's fault.
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