SSH Connection Issues

Hi folks,
I like zerotier a lot, privately and i have already built my small network which consist of

  • A windows PC
  • A Fedora linux running in VirtualBox on my Laptop
  • A Mac MINI

When I am at home all these computers are in the same local network AND in the same Zerotier Network, communication within the zerotier network(172.31…) works perfectly (ssh)
Fedora is running bridged network to its host windows pc.

When I take my laptop to my working place, the Fedora Linux in the VM still has internet and
the ZeroTier homepagepage also shows all devices active less than a minute ago.
However, when i try to make a ssh connection from my fedora to my mac over the zerotier network, its not working anymore

Are there any firewall requirements (opened ports) ?

when I ssh from fedora to mac over the zerotier network successfully and take the laptop to the company, the ssh connection is still active. howwever, when i logout i fail to login again, until I am at home again.

Any suggestion on how to debug my issue ?