We are not supporting both HTTPS and HTTP together for login to UI from 4.5-R7 .
Now in default Mode only HTTPS is enabled , if you enter HTTP URL it will redirect to HTTPS URL . This mode can be enabled by selecting HTTPS&HTTP in Administration TAB .(From WAN side redirection has some open issue which will be fixed in next release , You may need to access UI using HTTPS URL).
You can still enable HTTP login but in that case only HTTP will be allowed . This mode can be enabled by selecting HTTP in Administartion mode.