Connection tiemout issue with Auth API


we are integrating Duo Web SDK with our application.
While validating Web SDK authentication details we were using Auth API’s /ping, /check.

But when we execute them by using java-client code it is responding with Connection timeout error.
what could be the reason?

it works fine in our MAC/Windows Laptops.
But fails with our company VM’s(works with chrome browser and Postman REST client).