There are many scenarios where you have configured the range extender however at the end of the mywifiext.net set up wizard you get an error 404 and it states that you are not connected to the extenders wireless network. This kind of error probably occur when the range booster is too far from the main regular wireless router or you may have entered the incorrect password or the IP of the range extender gets conflict. When you get the this error you will see that your extender have only two solid green lights on it, which implies that the range extender that you are trying to hook up through mywifiext.net is partially connected to the main wireless network that you are using.

http://my-wifiext.net/