Free tool
Down for everyone or just me?
A site won't open? We try it right now from our server in Montreal, outside your network. If it answers for us, the problem is probably on your side, and we suggest where to look.
Where a visit can break
Opening a site takes four steps. When one fails, the browser often shows a vague message; this tool tells you which step is stuck, and whether it's stuck for everyone.
01
DNS
The name (example.com) is turned into an address. Expired domain or deleted records: nobody gets in.
02
Connection
The server must accept the connection. Server off, firewall or suspended plan: it times out or is refused.
03
HTTPS
The certificate must be valid and cover the name. Otherwise, a warning screen for every visitor.
04
The page
Code 200: all good. 500 to 504: the site or its CDN is failing. 403: access refused, often by a firewall.
It works here but not for you?
Your computer, your network and your provider are between you and the site. A stale DNS cache, an office firewall, a browser extension or a blocked IP address are the most common culprits. The quickest test: your phone on mobile data, Wi-Fi off.
Frequently asked questions
Is this site down for everyone or just me?
The tool tries the site from our server in Montreal, outside your network: DNS, connection, certificate, response code and response time. If it answers for us, the problem is probably on your side.
The site works for you but not for me: what now?
Your computer, your network and your internet provider sit between you and the site. A stale DNS cache, a firewall, a browser extension or a blocked IP address are the most common causes. Try your phone on mobile data with Wi-Fi off.
What do codes 200, 403 and 500 to 504 mean?
Code 200 means all is well. Codes 500 to 504 mean the site or its CDN is failing. Code 403 means access is refused, often by a firewall.
