make sure na updated ang tap adapter driver mo.
1. close openvpn gui if its running
2. go to services and look for OpenVPN Interactive Service and stop the service
3. restart OpenVPN Interactive Service
4. launch openvpn gui and try to connect
mas better if you'll use the latest openvpn client which is 2.4. if ayaw pa rin, put a routing protocol
route <server ip> 255.255.255.252
ifconfig 10.0.8.1 10.0.8.2
you can get the ifconfig value sa log, just look for a parsing error on host