Stefan, Would you check that you have net.inet.tcp.always_keepalive=1, and perhaps that net.inet.tcp.keepidle and net.inet.tcp.keepintvl are reasonable to ensure that the expected keep alives are running. I don't have a FreeBSD 13 to view the defaults, but Helge might be right that "it" is already fixed :) Regards, Dewayne.
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