A "502 Bad Gateway" error occurs when a server acting as a gateway or proxy receives an invalid response from an upstream server. This means that the server you are trying to access is unable to communicate properly with another server that it relies on to fulfill your request. This error can happen for various reasons, such as server overload, network issues, or misconfigurations. It is not an issue with your device or internet connection, but rather a problem on the server side, often related to the web server or hosting provider.