In reply to senduran:
Indeed it is past tense - I missed that. Presumably it was precisely done by means of a new port.
My comment about concern re IPv6 was a bit historical; I doubt many RO users actually need it yet since IPv4 has proved as resilient as RO itself in continuing to survive. At some point the Internet will move though and then we'll be glad it's available.
I understand that both Windows and MacOS now ship with dual stack solutions so they can work in the trial IPv6 networks around the world. Perhaps it's such a solution that Castle have?