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SSL Site to Site VPN without of function

Hello everybody,
we have one SG115 in the Main Office and 2 Brunches with SG105 (Firmware 9.510-5) 
After a few weeks both SSL Site to Site VPN connections are sudden without function.
On the Branch offices the SG105 is located behind a Router from the internet provider.
Anyone have an idea?
 
See Log:
 
2019:01:28-15:23:55 fw01 openvpn[15424]: PLUGIN_INIT: POST /usr/lib/openvpn/plugins/openvpn-plugin-utm.so '[/usr/lib/openvpn/plugins/openvpn-plugin-utm.so] [REF_SslCliOffice]' intercepted=PLUGIN_UP|PLUGIN_DOWN|PLUGIN_ROUTE_UP|PLUGIN_ROUTE_PREDOWN
2019:01:28-15:23:55 fw01 openvpn[15424]: Socket Buffers: R=[87380->87380] S=[16384->16384]
2019:01:28-15:23:55 fw01 openvpn[15424]: Attempting to establish TCP connection with [AF_INET]79.xxx.xxx.xxx:443 [nonblock]
2019:01:28-15:23:55 fw01 openvpn[15424]: MANAGEMENT: Client disconnected
2019:01:28-15:23:55 fw01 openvpn[15739]: MANAGEMENT: Client disconnected
2019:01:28-15:23:56 fw01 openvpn[15424]: TCP connection established with [AF_INET]79.xxx.xxx.xxx:443 (via [AF_INET]192.168.xxx.xxx:46363)
2019:01:28-15:23:56 fw01 openvpn[15424]: TCPv4_CLIENT link local: [undef]
2019:01:28-15:23:56 fw01 openvpn[15424]: TCPv4_CLIENT link remote: [AF_INET]79.xxx.xxx.xxx:443
2019:01:28-15:23:56 fw01 openvpn[15424]: Connection reset, restarting [-1]
2019:01:28-15:23:56 fw01 openvpn[15424]: PLUGIN_CLOSE: /usr/lib/openvpn/plugins/openvpn-plugin-utm.so
2019:01:28-15:23:56 fw01 openvpn[15424]: SIGHUP[soft,connection-reset] received, process restarting
2019:01:28-15:23:56 fw01 openvpn[15424]: DEPRECATED OPTION: --tls-remote, please update your configuration
2019:01:28-15:23:56 fw01 openvpn[15424]: OpenVPN 2.3.10 i686-suse-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [MH] [IPv6] built on Jun 29 2017
2019:01:28-15:23:56 fw01 openvpn[15424]: library versions: OpenSSL 1.0.2j-fips 26 Sep 2016, LZO 2.09
2019:01:28-15:23:56 fw01 openvpn[15424]: Restart pause, 10 second(s


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