You are not the only person that has mywifiext not working. When attempting to access the Netgear extender configuration page, many users encounter this issue. Make sure you are using the correct web address and that your device is linked to the extender network. Try a different browser or clear the cache in your current one. https://mywifiextlogn.com/facing-mywifiext-local-not-working-issue-with-n300-extender/