Cheers all, TL;DR version:
I've recently found that at least on my test box the `LISTEN *` line had only set up an IPv4 `0.0.0.0` listener but not an IPv6 `::0` listener for `upsd`. In fact, at least on a "dual-stack" system, it seems impossible to bind to both - so depending on binding order I either lose IPv6 or lose IPv4 directly (but have it practically as IPv4-over-IPv6). Given that `LISTEN *` support is in fact not documented explicitly (I think), I am inclined to define it as listening to "any" on whatever address families are available and supported by the NUT build, and somehow ensuring that to the best of our capability (technical puzzles exist - see GitHub issue). Detailed musing and logs are posted in https://github.com/networkupstools/nut/issues/2012 Pro/Con ideas are welcome :) Jim
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