First note the exact error and time. Try a second site to see whether general connectivity works, then check the affected service’s official status page. A public report spike can suggest a wider incident, but absence of reports does not rule one out.
Next, compare another device or network, such as mobile data versus Wi-Fi. If the site works elsewhere, test a private window and disable extensions temporarily. Check the URL and avoid repeated sign-in attempts if authentication is failing. Clear site data only after simpler checks, because it may sign you out or remove local state. If the problem persists, share the error, location, and tests already tried with support—never a password or session token.
Capture evidence before changing anything: exact URL, timestamp and timezone, browser message, HTTP code if visible, and whether DNS or the secure connection failed. Test the same device on another network and another device on the same network. Clear only that site's data after safer checks; clearing every cookie can destroy useful sessions without fixing a routing or certificate problem. If a payment or form submission was in progress, verify its outcome before retrying.
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