koush/AndroidAsync — pull request #239 by nifhel (2014-09-10 09:01:25+00:00)
Title: Catching UnresolvedAddressException in AsyncServer Connectresolvedinetso...

UnresolvedAddressException is a subclass of IllegalArgumentException, not a subclass of IOException, which is why you won't catch it if it's thrown.
http://docs.oracle.com/javase/7/docs/api/java/nio/channels/UnresolvedAddressException.html