RFR: 8373704: Improve "SocketException: Protocol family unavailable" message [v2]

[Lutz Schmidt]

On Thu, 18 Dec 2025 16:39:06 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> 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.
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adjust the message as suggested by jaikiran

Changes look good.

-------------

Marked as reviewed by lucy (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28851#pullrequestreview-3621895310