When your whole internet works but a single website refuses to load, the cause is almost always one of six things. Here's how to diagnose which one — using free tools, in about two minutes.
Step 1: Is it down for everyone, or just you?
Run the domain through a website down checker. If the checker also fails, the site genuinely has a problem and there's nothing to fix on your side. If the checker reaches it fine, continue.
Step 2: Check the DNS records
Use the DNS records tool. If the domain has no A records, or resolves to a different IP than expected, the domain's DNS is misconfigured or expired — a classic cause of "one site won't load".
Step 3: Check the SSL certificate
An expired or mis-issued certificate makes browsers block a site with a scary warning while other sites work. The SSL checker shows the certificate's validity dates instantly.
Step 4: Test from another region
Some outages are regional (a local CDN edge or a country-level block). Ask a friend in another city, or use the site's status page history to spot regional patterns.
Step 5: Rule out local causes
Flush your DNS cache, disable VPN/ad-blockers, and try mobile data — the full checklist is in our 9 fixes guide.
Step 6: Measure the connection
The speed test tool shows DNS lookup time, connection time and TTFB. A huge DNS time points at your resolver; a huge TTFB points at the site's server.
Two minutes with these tools tells you exactly who owns the problem: you, your ISP, or the website.