Virtual machine can not access internet in a different WLAN

[basense]

Hello,

I set up a small virtual network with VirtualBox:
just some virtual machines: clients and pfSense as router on my laptop.
With my laptop I access Internet with WLAN.
When I am at home I can access WLAN with my laptop and when I go out and use another WLAN I can access Internet with my laptop without problems.
But not with the virtual machines!
At home I can access internet with the virtual machines but unfortunately not when I go out and use another WLAN.

What to do?

[viragomann]

@basense
Can you check out if it's an DNS issue? Try to ping a public IP, e.g. 8.8.8.8.

If that fails as well, is pfSense able to access the internet?
If not, it might rather be an issue or wrong settings in VirtualBox.