found the problem:
Jul 5 23:30:51 openvpn 19584 OpenVPN 2.3.11 amd64-portbld-freebsd10.3 [SSL (OpenSSL)] [LZO] [MH] [IPv6] built on May 16 2016
Jul 5 23:30:51 openvpn 19584 library versions: OpenSSL 1.0.1s-freebsd 1 Mar 2016, LZO 2.09
Jul 5 23:30:51 openvpn 19913 Could not retrieve default gateway from route socket:: No such process (errno=3)
Jul 5 23:30:51 openvpn 19913 NOTE: the current –script-security setting may allow this configuration to call user-defined scripts
Jul 5 23:30:51 openvpn 19913 Initializing OpenSSL support for engine 'rdrand'
Jul 5 23:30:51 openvpn 19913 Control Channel Authentication: using '/var/etc/openvpn/server1.tls-auth' as a OpenVPN static key file
Jul 5 23:30:51 openvpn 19913 TUN/TAP device ovpns1 exists previously, keep at program end
Jul 5 23:30:51 openvpn 19913 TUN/TAP device /dev/tun1 opened
Jul 5 23:30:51 openvpn 19913 ioctl(TUNSIFMODE): Device busy: Device busy (errno=16)
Jul 5 23:30:51 openvpn 19913 do_ifconfig, tt->ipv6=1, tt->did_ifconfig_ipv6_setup=0
Jul 5 23:30:51 openvpn 19913 /sbin/ifconfig ovpns1 10.20.30.1 10.20.30.2 mtu 1500 netmask 255.255.255.0 up
Jul 5 23:30:51 openvpn 19913 /usr/local/sbin/ovpn-linkup ovpns1 1500 1560 10.20.30.1 255.255.255.0 init
Jul 5 23:30:51 openvpn 19913 Listening for incoming TCP connection on [AF_INET]86.126.1.236:1194
Jul 5 23:30:51 openvpn 19913 TCPv4_SERVER link local (bound): [AF_INET]86.126.1.236:1194
Jul 5 23:30:51 openvpn 19913 TCPv4_SERVER link remote: [undef]
Jul 5 23:30:51 openvpn 19913 Initialization Sequence Completed
Not able to get default gw.
How to solve it now?