WordPress shows this when PHP stopped dead. How to read the real error, get back into the dashboard, and find the plugin or theme behind it.

Error 525 means Cloudflare reached your server and could not agree a secure connection with it. The five causes, in the order they actually happen.

The server refused your upload for being too big. What a visitor can do in a minute, and the four places a site owner has to raise the limit.

A script error is two different problems with one name. The pop-up on a web page, and the empty “Script error” in a developer log. Both are covered here.

Windows says this when your computer never got an address from the router. Seven fixes in order, from the thirty second one to reinstalling the adapter.

This means your browser asked and nothing answered in time. How to tell whether it is your computer, your network or the site, and what to do in each case.

Queued means Gmail has your message but has not sent it yet, almost always on a phone. Why it happens, and the six things that clear it.

Your computer remembers where websites live, and a stale answer sends you to the wrong place. The commands for each system, and when flushing will not help.

A JSON file is plain text, so you already have something that opens it. The quickest way on each device, and what to do with a huge or broken one.

This error means the connection dropped without warning, usually between you and the server. Eight causes, worked through from the most common down.