In [JDK-8373676](https://bugs.openjdk.org/browse/JDK-8373676) we noticed a "SocketException: Protocol family unavailable" because of missing ipv6 support. We could improve this exception and tell that the ipv6 support is not available or something related.
------------- Commit messages: - JDK-8373704 Changes: https://git.openjdk.org/jdk/pull/28851/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28851&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8373704 Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/28851.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/28851/head:pull/28851 PR: https://git.openjdk.org/jdk/pull/28851
