Thus, there are many setup errors that can occur while the Linksys re7000 setup. First and foremost, failure in power supply could make the extender not show up in the network list. If the wired connection is present between the extender and router, then the Ethernet wire could be an issue for lack of performance, and a breakdown in the wire could also be the reason. Other than that, it might be the wrong web or wrong IP address you are typed in for setting up from a setup portal due to which the setup does not proceed, or there might even be some issues in the web portal from the back end. Then login errors definitely appear when entering an incorrect username or password as login credentials. The last cause of errors is failing to follow the setup points in the correct order, hence not completing the setup.