Samsung Galaxy A3 (2016) cannot connect to a wireless network device

Samsung Galaxy A3 (2016) cannot connect to a specific wireless network device.
Connected to my local wifi. Can access other devices except one device. My other Samsung S2 tablet or my desktop PC can connect but not my phone. There are no other obvious connection issues with the phone.
The phone makes the initial connection then when I attempt to sign in ( UN/PW) the connection is lost.
Have tried
resetting the phone.
different browsers
removing knox
removing Norton
but no change.
please help?

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