No wify no authentication

Can only guess at possible answers.

For example, see if this is relevant.

https://forums.androidcentral.com/htc-one-m7/278325-wifi-authentication-problem.html




WiFi Authentication problem Android Forums at AndroidCentral com

Reads like you've got a faulty wifi module on the Nexus. Have you got warranty?

This could be a dhcp issue, try using a fixed IP address when logging in.

try making it "forget" the wifi network, then restart it. then finnaly put the wifi password back in, see what happens.

You will get an 'authentication' problem trying to connect to this dlink 600 or any other wifi services/routers that are 'protected' and encrypted using WEP or WPA or WPA2 security (e.g. not public or 'OPEN' network): apart from the SSID, you will need to set your android tablet or ipad to use the WEP or WPA or WPA2 PASSWORD/PASS KEY to successfully connect (you get it from the Wifi/Router administrator).

trying dumbing down the authentication on your wifi router. Try these:
turn off 40mhz wide channels
try wpa instead of wpa2
try tkip instead of aes

if all else fails, try wep.

am having authentication problems with my irulu wifi tab

Can't get unit to connect to my home wifi , keeps giving message Authentication Problem

Yeah, they confirmed that they have some problem on some wifi authentication especially when your AP is configured to WPA-PSK (TKIP or AES).

you can only connect wifi with open, shared, WEP 64 and 128bit authentication and WPA/WPA2. Samsung still dont have any solution to this big issue. Been a lot lately to customer service in plaza sing, talked to the manager a lot with this problem,
still NO SOLUTION. You can't even have a full refund, no change model.