While accessing the wifi.wavlink.com setup portal, there can be a case that you get some errors or difficulties. Several reasons could be there that can make the portal accessing process impossible. Such as the existing router’s expired internet plan, weak signals from it, and weak connection between devices and others. So, to get rid of them, verify each point separately and try fixing the errors using troubleshooting tips. Foremost of all, check the wavlink device placement if that is in the range of the router or not. If it is not, then move it near the router and pick the best location for it. That can be the center of your house which must be above the ground. Also, try keeping the electrical appliances away from these WiFi devices. 

Later, check your networked device’s settings if all these are well managed or not. If they are not then, do them by making some required changes. In an alternative way, you can choose another device and a different web browser. Make sure you use the default details of the extender in the right way.