What is a 504 Gateway Timeout Error (and How Can I Fix It)?

A 504 Gateway Timeout Error happens when a server that was attempting to load a web page did not get a response in time from another server. Almost always, the error is on the website itself, and there’s nothing you can do about it but try again later. Still, there are a few quick things you can try on your end.
by Yuvraj Wadhwani via How-To Geek