Adware.Gen Activity 6

Hi All,

 

I have a mac running OSX El Capitan with the latest upgrades. I run Norton Security 6.4. Recently I keep getting pop up messages from my Norton Software telling me that my MAC has Adware.Gen Activity 6. I have run full system scans and I am told everything is ok. However it's not as I keep getting messages that Norton has blocked Adware.Gen Activity 6 which is trying to contact IP address 54.235.143.178 using TCP on Port 80 at the following address ec2-54-235-143-178.compute-1.amazonaws.com. How do I fix this. I have searched everywhere and don't see an answer. 

Thanks in advance

Arthur