[strongSwan] "signal of type SIGINT received. Shutting down" ?

[Hoggins!]

Hello list,

I don't understand why one of my StrongSwan clients disconnects from its
server.
When it happens, it begins with this entry in the logs :

    Jan 17 21:12:59 yomama charon: 00[DMN] signal of type SIGINT
    received. Shutting down


Then :

    Jan 17 21:16:14 yomama charon: 00[IKE] sending DELETE for IKE_SA
    net-net[1]
    Jan 17 21:16:14 yomama charon: 00[ENC] generating INFORMATIONAL
    request 2 [ D ]
    Jan 17 21:16:14 yomama charon: 00[NET] sending packet: from
    192.168.1.72[4500] to 51.254.26.13[4500] (80 bytes)
    Jan 17 21:16:14 yomama charon: 01[KNL] creating acquire job for
    policy 192.168.22.10/32[tcp/ssh] === 192.168.55.3/32[tcp/47700] with
    reqid {1}
    Jan 17 21:16:16 yomama charon: 00[DMN] Starting IKE charon daemon
    (strongSwan 5.6.1, Linux 4.9.2, x86_64)
    Jan 17 21:16:16 yomama charon: 00[CFG] loading ca certificates from
    '/usr/local/etc/ipsec.d/cacerts'
    Jan 17 21:16:16 yomama charon: 00[CFG] loading aa certificates from
    '/usr/local/etc/ipsec.d/aacerts'
    Jan 17 21:16:16 yomama charon: 00[CFG] loading ocsp signer
    certificates from '/usr/local/etc/ipsec.d/ocspcerts'
    Jan 17 21:16:16 yomama charon: 00[CFG] loading attribute
    certificates from '/usr/local/etc/ipsec.d/acerts'
    Jan 17 21:16:16 yomama charon: 00[CFG] loading crls from
    '/usr/local/etc/ipsec.d/crls'
    Jan 17 21:16:16 yomama charon: 00[CFG] loading secrets from
    '/usr/local/etc/ipsec.secrets'
    Jan 17 21:16:16 yomama charon: 00[CFG]   loaded IKE secret for %any
    92.222.188.77
    Jan 17 21:16:16 yomama charon: 00[CFG]   loaded IKE secret for
    yomamaRADIOM
    Jan 17 21:16:16 yomama charon: 00[CFG]   loaded IKE secret for
    netnetYomama
    [...]


So basically StrongSwan restarts, I can't figure out why, and I lose
packets.

Where should I look ?

Thanks !

    Hoggins!

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