I recently moved into a new apartment with Ethernet ports in every room. There is a central panel where all the cables end up at, and everything is labeled so I know which cable belongs to which room.

There are 17 Ethernet ports in total, but only 2 of them seem to work. I have tried connecting all of them individually, but only in two of them (numbers 13 and 15), the green light turns on on the router (see picture for reference) and I am able to connect to the internet.

Anyone that knows what the issue might be? Any help is much appreciated!