Can't login to N300/EX2700
Solution to this is:
Connect to netgear ext on wifi before trying WPS or after factory reset.
As the previous link suggests ignore the pop up box for registration. Open a window on chrome or safari or whatever. Type the router IP address and this links you to the same page .
Put in your details and your in.
I triehad the same problem as others after having registered the standard way with the pop up box but I couldnt log in. So I tried this and bingo!!!!!