I don’t know what a pi hole is actually.
I am using NETLINK GPON ONT 2GE+1POTS+ac WIFI (HG323DAC) router on BSNL FTTH. When I am trying to login to router to change DNS it’s not allowing me at all. So stopped trying it.
I just using Cloudfare dns in my PC and google dns in my android phone.
While using Cloudfare or Google dns in PC any site opens without any problem but while in phone it gives above error even for 1337x.to also.