VPN dropping time to time for few seconds

[drummer]

Hi,
i am facing an issue with my VPN config. I have 1 central ZS, and two other ZS instances, and have configured LAN to LAN

ZS1<>ZS2
ZS3<>ZS2

So the main point is ZS2 (configured as VPN server). The issue is, that time to time VPN drops without any reason (every 10-45 min)
Here is the log:

15:22:06 	Interface VPN06 is UP

15:28:34 	[Extern_IP] Inactivity timeout (--ping-restart), restarting

15:28:34 	/root/kerbynet.cgi/scripts/vpn_mii VPN06 1500 1575 init

15:28:34 	SIGUSR1[soft,ping-restart] received, process restarting

15:28:34 	Interface VPN06 is DOWN

15:28:35 	NOTE: the current --script-security setting may allow this configuration to call user-defined scripts

15:28:35 	TUN/TAP device VPN06 opened

15:28:35 	Listening for incoming TCP connection on Extern_IP:1201

15:28:40 	TCP connection established with Extern_IP2:50234

15:28:40 	TCPv4_SERVER link local (bound): Extern_IP:1201

15:28:40 	TCPv4_SERVER link remote: Extern_IP2:50234

15:28:44 	[Extern_IP] Peer Connection Initiated with Extern_IP2:50234

15:28:46 	Initialization Sequence Completed

15:28:46 	Interface VPN06 is UP

I have configured –keepalive 10 60 on the client VPN ZS server parameter, but still experience the same issue. I have the same issue also between both connections. What could be wrong ?

Thanks

[Author]

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