archerprincess,
Firstly, do you have access to your server from work otherwise?
If you do, it means either (or both,) of your router settings and firewall need altering:
On your router, you will need to forward the 9999 port, (if that’s what you’re using,) to your server.
On your firewall, you need to check that there is an exception to allow FirePlay on the same port, to have access.
HTH,
Colin