1）报FlushIpNetTable failed on interface错误

应对：以管理员身份运行OpenVPN

2）报Warning: route gateway is not reachable on any active network adapters错误

应对：以管理员身份运行cmd，执行：

netsh int ip reset logfile.txt

netsh winsock reset catalog

然后重启机器

3）报ROUTE: route addition failed using CreateIpForwardEntry: 至少有一个参数不正确

应对：配置文件中增加：

route-method exe

route-delay 2