Start here
The essentials
Every guide in this topic
-
How to fix 429 Too Many Requests
A rate limit was hit. Slow down if you are the visitor; if you run the site, decide whether the limit is protecting you…
-
How to fix 404 Not Found errors on your site
A few 404s are normal. Sudden ones, or every page except the home page, point to a broken rewrite, a moved page or a…
-
How to fix 403 Forbidden
The server found the page but will not show it. Usually file permissions, a missing index file, or a security rule. Here is how…
-
How to fix 503 Service Unavailable
The server is up but refusing work for now: maintenance mode, an overload, or a limit being hit. How to tell which, and clear…
-
How to fix 500 Internal Server Error
A 500 is the server’s way of saying “something broke and I won’t say what”. The error log will. Here is where to find…
-
How to fix 504 Gateway Timeout
The backend is alive but too slow. Find the slow request, raise the right timeout only if the work is genuinely long, and fix…
-
How to fix 502 Bad Gateway
A 502 means the web server asked the program behind it for a page and got no usable answer. Find which part failed in…