This error only happens when I spawn the ios-driver jar as a Node.js child.
The error is java.net.SocketException: Protocol family unavailable
seleni
I don't have much idea about it, what so far I've found is that this can be binding issue with java. More details is on following link:(It is not the updated information, it may lead to answer)
http://diario.beerensalat.info/2008/10/12/java_and_ipv6_on_bsd.html
If that is not the case, as this post suggests to change it to higher port should work. "Protocol family unavailable" error while using VisualVM