The encyclopedia
Every website error, diagnosed & fixed.
A plain-English reference for every way a website breaks — what causes it, and exactly how to fix it. Browse by category, or let us scan your site and find it for you.
06 errors
HTTP Status Errors
404, 500, 502, 503 and the rest of the status-code family.
02 errors
SSL & HTTPS Errors
Certificate, padlock and "Not Secure" warnings.
01 error
DNS & Domain Errors
Domains that won’t resolve, propagation, nameservers.
00 errors
Speed & Core Web Vitals
Slow loads, layout shift, render-blocking.
00 errors
Technical SEO Errors
noindex, canonicals, sitemaps, structured data.
01 error
Broken Links & Redirects
Redirect loops, chains, dead internal links.
00 errors
Security & Blocklisting
Malware flags, "deceptive site", missing headers.
02 errors
WordPress & CMS Errors
White screen, database connection, plugin conflicts.
00 errors
Email & Deliverability
SPF, DKIM, DMARC, spam-folder problems.
00 errors
Hosting & Server Config
PHP limits, resource caps, gateway failures.