HTTP errors and browser-related issues
Error 4000 indicates the browser could not establish a secure connection to the requested server. It often appears when the server’s SSL/TLS certificate is invalid, expired, or the network blocks the connection.
HTTP 429 signals that the client has sent too many requests in a given time window. The server is protecting itself from overload or abuse and temporarily blocks further requests.
HTTP 407 tells the browser that the proxy server blocks the request until you authenticate. The browser stops until valid credentials are supplied.
Error 500 means the web server encountered an unexpected condition that prevented it from fulfilling the request. The server is functioning but something went wrong while processing the page.
The HTTP 404 Not Found error indicates that the client (browser) requested a resource (URL) that the server could not locate. It is a client‑side error, meaning the request was valid but the server has no content at the requested address.
