Website Down Checker

About the Website Down Checker

Find out whether a website is down for everyone or only for you. MySmartCoPilot’s server requests the address from the Cloudflare data centre that handled your visit — usually one near you — and reports whether it answered, the HTTP status code, how long it took and where redirects led. When it fails, you see the exact reason: a domain that does not exist, missing DNS records, a timeout, a refused or failed secure connection, an invalid certificate, a server error, or one of Cloudflare’s own error codes.

At the same time your browser tries to reach the site directly. If MySmartCoPilot can reach it and you cannot, the problem is on your side — your DNS cache, VPN, network or internet provider — and the page lists the fixes, including the commands to clear your DNS cache.

Common uses

• A site will not load and you want to know whether to wait or fix something on your side.
• Telling a customer or colleague whether your site is reachable from outside your office network.
• Getting the precise error (DNS, TLS, timeout, 5xx) to give your hosting provider.
• Checking a site after DNS, hosting or certificate changes.

What the errors mean

• Domain does not exist (NXDOMAIN): a typo, an expired domain, or one that was never set up.
• No A or AAAA records / DNS failure: the domain exists, but its DNS does not say where the server is, or its DNS servers are failing.
• Timeout or connection failed: the server is down or overloaded, nothing listens on the port, a firewall drops the connection, or the secure (TLS) connection cannot be set up.
• 5xx status (500–599): the server answered but could not produce the page (RFC 9110 §15.6).
• Cloudflare 520–526 and 530: the site uses Cloudflare and the problem is between Cloudflare and the site’s own server — 521 “web server is down”, 522 “connection timed out”, 524 “a timeout occurred”, 525 SSL handshake failed, 526 invalid SSL certificate, 530 Cloudflare could not resolve the origin’s address (Cloudflare 5xx errors).
• 4xx status: the site is up, but this page is missing (404), needs a login (401), refuses the request (403 — often bot protection or a regional block) or is rate-limited (429).

Why “just you” happens

• Your device or router still uses an old or wrong DNS answer — clearing the DNS cache or switching to another resolver fixes it.
• A VPN, proxy, firewall, antivirus or browser extension blocks or reroutes the connection.
• Your internet provider, company, school or country blocks the site, or a route between you and the site is broken.
• The site blocks your network or region, or one of its servers fails while others work.

How the check is made

MySmartCoPilot’s server runs on Cloudflare’s network: the request comes from the data centre that received your visit (shown with the result). It looks the name up over DNS-over-HTTPS, refuses private and internal addresses, then sends a GET request as MySmartCoPilotBot without cookies, follows up to 5 redirects (browsers allow 20) and waits up to 10 seconds per request. The browser test asks the site from your own connection without cookies or a referrer. Browsers do not reveal another site’s status code to a web page, so it can only tell whether something answered — an error page counts as an answer too.

Some sites tell browsers not to share their pages with other websites at all (the Cross-Origin-Resource-Policy: same-origin header), and a secure page may not follow a redirect to an http:// address. MySmartCoPilot’s server sees both in the site’s answer; the browser test is then marked Can’t tell instead of reporting that you cannot connect.

Limitations

• One check from one location: an outage that affects only some regions or networks may not show.
• Some sites block automated or cloud-based requests (403, bot checks) while working for people in a browser.
• The browser test cannot see status codes, and ad or privacy blockers can make it fail. It cannot test sites that forbid other websites to read them (Cross-Origin-Resource-Policy); the result then rests on MySmartCoPilot’s check alone.
• Browsers do not let a secure page contact http:// addresses, so http:// sites are tested from MySmartCoPilot’s server only.
• It checks once when you press the button — it does not monitor a site or send alerts. Each visitor has an hourly limit.

Privacy

The address you enter is sent to MySmartCoPilot’s server, which requests it from the site (as MySmartCoPilotBot, without cookies) after a DNS-over-HTTPS lookup. With the browser test on, your browser also requests the site directly, without cookies or a referrer, so the site sees your IP address as it would if you visited it. MySmartCoPilot does not store the address or the result; its log records only the host, status code and time of each request.