If the device and the PC that runs the web browser are in the same network, you can find that even though other applications, for example, Telnet, can access a particular switch, the web management interface cannot. This situation can occur if the web browser has a proxy server that resolves the www path and returns the reachable IP address to the browser. If no route exists from the proxy server to the device, the HTTP query does not reach the device, and does not receive a response.
To prevent this problem, ensure that if the web browser uses a proxy server, you specify a route from the proxy server to the device.