@wallisdj I could try to explain it as good as I can but you need to have access to the router of the network your computer is in. Otherwise this does not work. Also sometimes if you live for example in a student dorm you might need to ask a technician if these ports are closed on the central router for the dorm and if they could open it.
So depending on the provider the ports, that need to be opened might be different.
These are the ports you should try to open and check starting at which point it works, because maybe some ports you can leave closed.
TCP: 80; 443; 9960-9969; 1024-1124; 18000; 18120; 18060; 27900; 28910; 29900. UDP: 1024-1124; 18000; 29900.
To do so you should access your router over a browser (standardized it has the IP dress 192.168.0.1, if no-one changed it.). So type that IP into your browser.
On the page that pops up you should log into your router. You will need the admin account for this.
Once logged in you should try and google on which tab or menu you can find the option for closed ports for your special provider (as i said for unity media it is under the advanced options tab under port-filter).
Then you need to check if the above mentioned ports with the corresponding protocol (TCP or UDP) are in the list of blocked ports.
If you can find some of them take them out of the list (Thus opening the ports).
And if that was your initial problem sims 4 should be able to connect to the gallery when opening the game.
Hope I could help
