What is a 502 Error Gateway Error? The "502 Error Gateway" error occurs when the server receives an invalid response from the requested page. This issue can be caused by a number of reasons and the error message may vary depending on your server. When a user visits a WordPress site, their browser sends a request to the server, which then retrieves the page and sends it back to the browser. If an error occurs, the browser will display an error status code, such as 502 Bad Gateway. 502 Error...