Dear maintainer, After sending this report, I started editing my logcheck configuration to ignore these messages for the time being, and I discovered that a similar message was already filtered out, but with a blank interface name. I'm guessing I added this filter while #903783 was open.
Indeed, looking at older logs, I can see that these messages were present at least as long ago as January: Jan 09 14:42:54 bean minissdpd[9821]: setsockopt(udp, IPV6_JOIN_GROUP)(FF02::C, ): Address already in use I'm not sure #903783 was actually fixed, at least for my system. Kind regards, Matijs van Zuijlen
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