Hi,
I have a Lumia 520 and facing the same issue pertaining to the Nokia account login. My ISP is Airtel via WiFi as well. I checked the DNS and 23.207.134.242 is the IP I got. When I contacted care they asked me to RESET the device. I feel that its a software issue and reset might not fix the issue since I see a lot of people complaining about the same. Should I do RESET or wait for some update OTA which will be pushed from your end?
The message which i see after Connecting and Gathering Data is
Network Problem
We couldn't complete that operation. Please try again later.
Regards,
Adarsh