Five stacked layers labelled DNS, connect, TLS, HTTP and content, with one layer flagged red

Guides9 Nov 2026 · 4 min read

Is your website down? A layer-by-layer troubleshooting guide for site owners

When your site stops loading, work through it in the same order a browser does: DNS, connection, certificate, HTTP response and content. This guide shows how to find the broken layer in minutes, what each error code…

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