Duck Cloud Blog

Practical guides for Duck Cloud tools, security, and workflows

Tutorials, SEO-friendly explainers, and step-by-step articles that link directly to the tools they describe.

Web Diagnostics

robots.txt Guide for SEO: Rules, Examples, and Common Mistakes

Learn what robots.txt can and cannot control, how User-agent and Disallow rules work, and how to avoid accidentally blocking important pages and site assets.

Sep 5, 2026

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Web Diagnostics

301 vs 302 vs 307 vs 308 Redirects: Differences, SEO, and Debugging

Understand permanent and temporary HTTP redirects, method-preserving behavior, redirect chains, loops, and practical migration choices for websites and APIs.

Sep 5, 2026

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Web Diagnostics

How to Check If a Website Is Down: A Developer Troubleshooting Guide

Diagnose a website that will not load by checking HTTP status, redirects, response headers, DNS records, and common server-side failures in the right order.

Sep 5, 2026

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Email Infrastructure

MX Record Troubleshooting: Why Email Is Not Arriving

Trace missing inbound email from DNS delegation and MX priorities through host resolution, SMTP reachability, SPF, DKIM, DMARC, queues, and provider logs.

Sep 5, 2026

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Web Security

HTTP Security Headers Checklist: CSP, HSTS, and More

A practical checklist for reviewing Content-Security-Policy, HSTS, framing controls, content types, referrer policy, permissions policy, and cookie security.

Sep 5, 2026

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Networking

How to Check DNS Propagation and Fix Stale Records

Learn what DNS propagation really means, how to inspect authoritative and recursive answers, and how to fix stale A, AAAA, CNAME, and nameserver records.

Sep 5, 2026

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