I've been using hamachi for years, and have been able to use hamachi to play games using LAN for years as well. However, a few weeks ago, ONE of my friends can't ping me and I can't ping him. We can't tell who's end it is on, because we both have the exact same settings. Using the hamachi diagnosis will sometimes give a "Traffic test: Timeout" as a result. What is going on, and how can I fix it?
Extra notes: We both have firewalls down, and have no antivirus interferring. (Even though we have windows defender, the friend that I can ping also has windows defender, so that isn't the issue). We both are using windows 10, and this has worked on windows 10 before, as well as windows 8, and Mac OSX.