Hi,
I done reset and started again but the same happends. I noticed that the configuration i done through the GUI not reflecting on GUI window after restart, but showing while checking on CLI. I Have the same issue with USG which i first purchased for the same use. After long try the supplier not able to provide a propper solution and he replaced it with the current ER-X.
Linksys, Dlink & Asus routers are working fine by just giving the ISP User ID & Password on PPPoE window. I am from U.A.E and the ISP is Etisalat.