Frequently Asked Questions
ErrorLookup FAQ
Quick answers for common troubleshooting, triage, and incident-response questions.
How is ErrorLookup different from a status code table?
Each guide explains meaning, likely causes, first checks, deeper checks, remediation options, and closely related errors.
Can I use this during a live production incident?
Yes. Start from the exact code or browser message, follow first checks to isolate layer, then use related guides to test alternatives.
Do Cloudflare 52x errors always mean the origin is down?
No. They can be caused by routing, TLS negotiation, firewall policy, or upstream timeout issues between edge and origin.
What is the quickest way to separate 502, 503, and 504?
Classify response type first (bad upstream response vs unavailable service vs timeout), then validate with proxy and origin logs.
When should I use comparison pages?
Use them when multiple plausible errors match the same symptom pattern and you need to avoid changing the wrong layer.
Are browser network errors the same as HTTP errors?
No. Browser network errors often occur before HTTP response handling, so DNS/TCP/TLS checks should come first.
Is homepage content available without JavaScript?
Yes. Core triage content and links are static HTML for reliability and crawlability.