DNS

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Introduction to Dynamic DNS The Domain Name System (DNS) is a system that translates human-readable domain names (for example, example.com) into IP addresses, allowing us to access websites and services on the Internet. Traditional DNS works well when devices have a static IP address, but what happens when the IP address changes frequently? This is […]

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Clearing your DNS cache forces your operating system or browser to discard locally stored DNS records and fetch fresh mappings from authoritative name servers. This single operation resolves a surprising range of connectivity failures — from ERR_NAME_NOT_RESOLVED errors to stale IP records left behind after a server migration. What is a DNS cache? It is […]

A "DNS server not responding" error means your operating system sent a resolution query to a DNS resolver and received no answer within the timeout window — so the browser never obtained the IP address needed to open a TCP connection. The result is a broken page load even when your physical network link is […]

Cloudflare Error 520 is an HTTP status code returned when Cloudflare's edge network receives an empty, unexpected, or otherwise uninterpretable response from your origin server. Unlike a 502 or 504, which indicate a gateway timeout or bad gateway, a 520 is Cloudflare's catch-all for responses that fall outside any recognized HTTP specification — meaning the […]

DNS (Domain Name System) is the internet's distributed naming infrastructure that translates human-readable domain names — such as example.com — into machine-readable IP addresses like 93.184.216.34. Without DNS, every browser request, API call, and email delivery would require users and applications to know the exact numeric address of every remote host, making the modern internet […]

The ERR_CONNECTION_REFUSED error means your browser sent a connection request to a web server, and that server actively rejected it — not ignored it, but explicitly refused the TCP handshake. This is a fundamentally different failure mode from a timeout (ERR_CONNECTION_TIMED_OUT) or a DNS failure (ERR_NAME_NOT_RESOLVED), and that distinction matters enormously when diagnosing the root […]

A 400 Bad Request is an HTTP/1.1 client error status code defined in RFC 9110 that signals the server received a request it cannot or will not process because the request itself is malformed. Unlike 5xx errors, which originate on the server side, a 400 error places the fault squarely on the client — meaning […]

The ERR_CONNECTION_TIMED_OUT error means your browser sent a connection request to a remote server but received no response within the allotted time window — typically 30 seconds in Chromium-based browsers. The TCP handshake never completes, so the browser abandons the attempt and surfaces this error instead of a loaded page. This is not a single-cause […]