I was connecting via mobile data. I just connected via wifi and works perfect. "'It could be that another device on that subnet does indeed have a malware intrusion that is causing what Google perceives to be a DOS attack and has blacklisted it from their servers."......say what??
Sorry...I have no idea what that means or how I get it to go away!
Furthermore, as a little experiment, I performed a factory reset on the new phone and got the same message "can't access to '/system/csc/ATT/system"