Thank you for your response. I get no error message. I click on firewall, unlock the firewall so I can make changes. I'm on a wireless network. The firewall is showing 2 networks. There is an xfinitywifi showing as not connected, and that is in there as home or work. It will not let me remove it. Then my wireless network is showing and it is in there as public, which is why I can't connect to anything over my wireless network. I try to change the wireless to home or work and as soon as I do the color wheel starts spinning and after about a minute, the window just disappears and another window opens up titled "Problem Report for Internet Security" and it has many lines showing exactly what happened. It allows me to send to apple or not. I've sent, but since it isn't their program, I have gotten nothing back from them. My version of MAC is 10.13.16 and my version of McAfee is 188.8.131.52.