Internet Error Codes
Knowledge Base
The comprehensive developer's guide to HTTP status codes, DNS issues, and platform-specific errors.
What Are Internet Error Codes?
Standardized messages indicating connection failures, server issues, or misconfigurations. We explain HTTP status codes, DNS failures, and platform-specific errors clearly.
How This Helps You
Every page follows a consistent structure:
- Clear, plain-language explanations
- Common causes (Server, Browser, Network)
- Step-by-step troubleshooting guides
Who It Is For
Built for developers, sysadmins, and site owners. Whether debugging a production outage or fixing a personal site, get reliable, structured information fast.
Error Categories Explained
Organized into clearly defined categories to make navigation and troubleshooting easier. Common issues such as 502 Bad Gateway, DNS_PROBE_FINISHED_NXDOMAIN, 404 Not Found, or SSL Handshake Failed are documented with clear explanations and step-by-step fixes.
Standard server response codes (404, 502) indicating configuration or availability issues.
Domain name resolution problems where a domain cannot be found or servers fail to respond.
Secure connection failures due to certificate problems, expired credentials, or protocol mismatches.
Issues specific to Cloudflare’s network, origin server connectivity, or SSL handshakes.
Client-side messages from Chrome/Firefox when connections fail, timeout, or are blocked.
Issues related to web server software (Apache, Nginx) caused by misconfigurations or backend failures.