Unable to connect PX4 with QGroundControl?

Please help me connect px4(running on Ubuntu-multipass) with qgc(running on Mac) via UDP. i have followed steps mentioned in the Issue above.

I would first make sure your VM can do simple networking to the M1 computer. Have you tried a simple ping or traceroute? double-check that they can talk to each other.

Yes, i performed both tracepath/traceroute and ping, they all work well.

finally. i was able to connect qgc and px4 by starting mavlink instance from command window to mac. Can this be made default, instead of always sending command for udp.