ItsUporDown
Back to Uptime Checker/Guides & Articles
Uptime & Diagnostic Guides

Network Guides, Outage Explanations & DNS Troubleshooting

Explore in-depth engineering breakdowns on diagnosing local connectivity bottlenecks, resolving 5xx gateway faults, and understanding global edge routing.

Featured GuideTroubleshooting6 min read

Is It Down or Just Me? The Ultimate Step-by-Step Diagnostic Guide

When a critical website refuses to load, follow this definitive 6-step checklist to isolate local DNS issues, ISP route failures, browser cache glitches, and genuine server outages.

Alex Vance
Alex Vance
Network Infrastructure Lead · October 3, 2026
Read Full Guide

More In-Depth Articles

HTTP Protocols7 min read

Decoding 500, 502, 503, and 504 Errors: What Server Outages Actually Mean

A deep-dive into the HTTP 5xx family. Understand the difference between an overloaded origin server, a broken edge gateway, and an expired reverse proxy handshake.

October 1, 2026Read
Architecture5 min read

How Global Edge Probes Detect Internet Outages in Under 200 Milliseconds

Inside the mechanics of distributed synthetic monitoring: DNS resolution trees, TCP handshakes, TLS protocol negotiation, and avoiding false positives.

September 28, 2026Read
Network & DNS6 min read

Why a Website is Down in Your City but Live in London: DNS Propagation & Anycast

Explore the fascinating reality of global Internet routing. Why nameserver caches, TTL windows, and regional BGP routing glitches cause localized outages.

September 24, 2026Read

Need to test a domain right now?

Our instant probe tests DNS resolution, TCP sockets, and HTTP responses worldwide in real-time.

Launch Main Status Checker