Clear, practical explanations for the codes and messages that interrupt your day. Find out what went wrong and what to try next.
Explore error codes ↓The address may have moved, or there may be a typo.
Search a code or message. Each guide gives you the short version and a few sensible next steps.
The server is reachable, but the requested page or resource cannot be found at that address.
Check the URL for typos, use the site search, or return to the homepage. If you manage the site, check the route, file path, and redirects.
The server understood the request but will not allow access to this resource.
Sign in with an account that has permission. Site owners can review access rules, file permissions, and security settings.
The request needs valid authentication before the resource can be viewed.
Sign in again, check whether your session expired, or confirm that the login details and authentication token are valid.
The server ran into an unexpected condition and could not complete the request.
Try again in a little while. Site owners should inspect application and server logs around the time of the error.
A server acting as a gateway received an invalid response from another server.
Refresh after a short wait. Administrators can check upstream services, proxy settings, and server health.
The service is temporarily unable to handle the request, often due to maintenance or high load.
Wait a few minutes and retry. Site owners can check capacity, maintenance mode, and service status.
A gateway or proxy did not receive a response from an upstream server in time.
Try again later. Administrators can investigate slow dependencies, network issues, and timeout settings.
Your device could not translate the website name into an IP address.
Check the spelling and your connection. Site owners can verify DNS records and nameserver configuration.
The browser could not verify a secure HTTPS connection to the website.
Check your device date and time. Site owners should verify the certificate, hostname, and certificate chain.
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404cool is an informative guide to common website errors. We break down what a message usually means and offer general steps you can try. Every website is different, so a code is a clue—not always the whole story.
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