Knowledge Base

Step-by-step fixes for the "DNS server not responding" error on Windows, macOS, Linux, and mobile.

Resolve the NXDOMAIN error caused by dns lookup failed or dns resolution failed events in Chrome and Edge.

Fix the "DNS probe finished no internet" error when DNS resolves but the connection still fails.

Troubleshoot the ERR_NAME_NOT_RESOLVED browser error across all operating systems.

Understand and fix ssl error, ssl certificate error, ssl connection error, ssl handshake failed, and certificate expired error messages.

Resolve the "Your connection is not private" error caused by an untrusted certificate authority.

Fix "access denied on server", "you don't have permission to access on this server", and 403 forbidden error messages.

Diagnose and resolve 502 Bad Gateway errors on Nginx, Apache, and cloud hosting platforms.

Understand why your server returns 503 and how to restore service quickly.

Identify the root cause of 504 Gateway Timeout errors and fix them at the server level.

Fix connection timed out, connection refused error, and network unreachable messages on any operating system.

Diagnose and fix api timeout error, api not responding, api returns 500 error, and endpoint not responding issues.

Why your site shows a "website temporarily down" message, is down but works for others, or shows a site unavailable error.

A plain-English explanation of uptime, SLAs, and what "99.9% uptime" actually means.