[strongSwan] Win7 L2TP/IPSEC clients disconnect every 8 hours

[Michael Ulitskiy]

Hello,
 
I've setup strongswan/openl2tp pair as l2tp/ipsec server for win7 clients.
IPSEC part is using PSK authentication.
Everything works fine except one problem. Win7 clients disconnect exactly every 8 hours.
It seems it fails to rekey IKE SA. The config is pretty standard:

ipsec.conf:
conn l2tp
        rekey = no
        type=transport    
        leftauth=psk
        rightauth=psk
        leftprotoport=17/1701
        right=%any
        rightprotoport=17/%any
        auto=add

I wonder if it's a known problem and if there's any fix for it. I did some googling, but didn't find any definitive answers.
Please help,
Thanks,
 
Michael
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