Articles & Guides
Useful resources for web developers and system administrators
AI
AEO (Answer Engine Optimization): A 2026 Guide
AEO (Answer Engine Optimization) explained: how it differs from SEO and GEO, answer-first structure, schema, voice, metrics, and a 2026 checklist.
Networking
Fix ERR_ADDRESS_UNREACHABLE: Causes and Solutions
ERR_ADDRESS_UNREACHABLE means the IP resolved but there is no route to it. Learn the causes — router, VPN, IPv6, private IPs — plus diagnostics and fixes.
Networking
How to Check Open Ports: Online, Windows, Linux
How to check open ports: netstat and Get-NetTCPConnection on Windows, ss and lsof on Linux, nc and telnet from outside, plus a free online port scanner.
DNS
Fix DNS_PROBE_FINISHED_NO_INTERNET: Causes and Solutions
DNS_PROBE_FINISHED_NO_INTERNET means Chrome cannot reach a DNS resolver. Causes and step-by-step fixes: flush DNS, reset Winsock, change DNS servers.
SSL/TLS
NET::ERR_CERT_AUTHORITY_INVALID: Causes and Exact Fixes
NET::ERR_CERT_AUTHORITY_INVALID means the issuer is untrusted. Find your case in one minute: missing chain, self-signed cert, antivirus, clock, proxy.
AI
How to Make Content Extractable for AI
A practical guide to content extractability for AI: the 40–60 word answer-block rule, query-shaped headings, tables, Schema markup and a checklist.
AI
GEO vs SEO: How AI Optimization Differs
GEO vs SEO explained: what they share (E-E-A-T, technical health), how they differ by goal, metrics, format and crawlers, whether to choose, plus a 2026 plan.
AI
Bing Copilot Optimization: How to Get Cited by AI
How to get cited by Bing Copilot: the link to Bing ranking, the role of Bingbot and Bing Webmaster Tools, Schema, IndexNow for fast indexing, and Google differences.
AI
Perplexity SEO: How to Get Cited in Answers
How to optimize for Perplexity: how it picks sources, allowing PerplexityBot in robots.txt, citation factors, GEO vs classic SEO, and checking your mentions.
AI
How to Appear in AI Answers: ChatGPT, Perplexity, Yandex
How to appear in AI answers from ChatGPT, Perplexity, Yandex and AI Overviews: extractable passages, sourced facts, Schema, AI crawler access, checklist.