The coaxial outlet I want to plug my modem into doesn't work

Hello. I currently live in an apartment unit where the only (seemingly) working coaxial outlet is very far from my entertainment center. However, there IS a coaxial outlet directly behind my entertainment center that I would really like to use instead. However, when I connect my modem, via coaxial cable, nothing happens, I get no internet. Is this something a tech could come out and fix?