Strongswan queue overflow

[QBANIN]

Hi,

Since a year or so I'm getting following hardware-independent error message that leads to non-responding GUI (ssh works) and all/most of my 17 Ipsec tunnel being disconnected.

netstat -Lan shows that 0xxxxxxxxx that it's always charon's queue overflowed.

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sonewconn: pcb 0xfffff80005b98300: Listen queue overflow: 5 already in queue awaiting acceptance (6 occurrences)

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unix  5/0/3                            /var/run/charon.vici
I think that the root of this issue is my easy-to-saturate LTE WAN connection that may lead to ipsec connection stall, but I'm not sure.

TL;DR Is there an option to increase charon's waiting connection queue from 3 to some higher value?

setting

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sysctl kern.ipc.somaxconn=4096 doesn't help