I use Jetbrains Intellij Idea. When I compile a project it fails with “Protocol Family Unavailable”. I need to turn off the firewall to continue. It then succesfully starts and I can see:
Starting Gradle Daemon…Connected to the target VM, address: ‘127.0.0.1:51059’, transport: ‘socket’
I do not see anything in firewall logs.
Similar issues: https://stackoverflow.com/questions/29323700/android-studio-gradle-error-protocol-family-unavailable