Решил проблему с изменением сетевых интерфейсов pfsense с VIRTIO на E1000.
Похоже, что некоторые пакеты теряются с драйверами Proxmox VIRTIO.
ИзБазовые спецификации Open Group, выпуск 7, издание 2018 г. ,Системные интерфейсы , в_exit
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If the process is a controlling process, the SIGHUP signal shall be sent to each process in the foreground process group of the controlling terminal belonging to the calling process.
If the process is a controlling process, the controlling terminal associated with the session shall be disassociated from the session, allowing it to be acquired by a new controlling process.
If the exit of the process causes a process group to become orphaned, and if any member of the newly-orphaned process group is stopped, then a SIGHUP signal followed by a SIGCONT signal shall be sent to each process in the newly-orphaned process group.