First of all, check whether the website address is correct, please ask the personnel department of this unit for the correct website address; Second, see if you log on to the intranet. If you log on to the external network, please log on to VPN first, then log on to the distance learning website, and finally log on for the first time. Check the controls to see if you need to install and add controls. Note that the browser version of IE kernel is too low to log in.