What is a 502 Bad Gateway Error (And How Can I Fix It)?

A 502 Bad Gateway Error occurs when you try to visit a web page, but one web server gets an invalid response from another web server. Most of the time, the problem is on the website itself, and there’s not much you can do. But sometimes, this error can occur because of a problem on your computer or networking equipment. Here are some things you can try.

via: howtogeek.com