Enter the address in our Is My Site Down tool: it requests the site from our server and shows the HTTP status and response time. If the site answers there but not for you, the problem is on your side — usually your DNS, browser cache, network or a local block. If it does not answer from our server either, the site is down or unreachable for everyone. The checklist below narrows it down in about two minutes.
Quick checklist
- Test from outside: use Is My Site Down. It checks both
http://andhttps://and follows redirects. - Try another site: if nothing loads, your internet connection is the problem, not the site.
- Switch networks: open the site on your phone with Wi-Fi turned off. If it works on mobile data, the issue is your home or office network, router or DNS.
- Try a private window: this rules out extensions, cookies and cached redirects.
- Read the exact error: the message tells you which layer failed (see the table below).
What the error tells you
| What you see | Likely cause | Down for everyone? |
|---|---|---|
| DNS_PROBE_FINISHED_NXDOMAIN, “server not found” | The name does not resolve: typo, expired domain, DNS problem | Sometimes; check DNS from outside |
| ERR_CONNECTION_TIMED_OUT | Server or network not answering, or a firewall drops your traffic | Often only a route or block on your side |
| ERR_CONNECTION_REFUSED | Server reachable but nothing listens on the port | Usually yes |
| HTTP 500 / 502 / 503 / 504 | The server or a proxy in front of it fails | Usually yes |
| Certificate warning | Expired or wrong certificate | Yes for everyone using HTTPS |
| Page loads but looks broken | CSS/JS from another domain blocked or a CDN problem | Possibly only for you |
Status codes are explained in detail in HTTP status codes explained, and name resolution errors in DNS_PROBE_FINISHED_NXDOMAIN and DNS server not responding.
If it is only you
- Flush DNS and restart the browser: on Windows
ipconfig /flushdns; see how to flush DNS cache for other systems. - Change DNS resolver: some ISP resolvers return stale or blocked answers; try a public DNS server.
- Disable VPN, proxy or security software briefly; they can block or reroute sites.
- Restart the router if several sites fail at the same time.
- Check whether your IP is blocked: a site’s firewall may block your address after failed logins or because it is on a blacklist.
If it is down for everyone
As a visitor, check the service’s official status page or social accounts and try again later. As the site owner, check in this order: domain expiry and DNS records (DNS Lookup), whether the server answers (Ping and Port Scanner on 80/443), the certificate (SSL Checker) and finally the application and server logs.
Common Questions
Why does a site work on my phone but not on my computer?
The phone on mobile data uses a different network and DNS. The problem is usually your home router, your DNS resolver, a VPN or proxy, or the browser cache on the computer.
The tool says the site is up but I still cannot open it. Why?
Our server reached it, so the site is running. Something between you and the site blocks it: your DNS, ISP, firewall, VPN, a blocked IP address, or a regional restriction.
Can a site be down only in some countries?
Yes. CDNs route visitors to different locations, and an outage, block or routing problem can affect only some regions or networks.
How often should I monitor my own site?
Use an uptime monitor that checks every one to five minutes from several locations and alerts you, rather than discovering outages from visitors.