Soap-UI 5.2.1 is giving UnknownHostException for an private URL but is working for another person

I got the Soap Ui project from a colleague. The same project is used by that colleague and is working fine.

I have already tried setting the vmoptions file for Soap-UI. But, it is not working.

Is there a specific reason that this might occur?

EDIT: As per Tim's suggestion adding some more details - I have already been using Soap UI for sometime and other test cases are running fine. Had setup vmoptions config early on. I can hit other other domains on the same network. I'm using MacOS and aforementioned colleague is using Windows. He sent me the xml project and I imported it.