Web Player build doesn't connect to my server, PC build works fine

My Windows build works perfectly when I connect to my server and it sends/recieves the JSON/HTTP data without any problem, but with Web Player build it never does. "Offline deployment" is already unchecked.

I know Web Player is deprecated so please don't just say "use WebGL", i'll use it as a last resort because I wanted to link the .unity3d from my dropbox and I don't know how the WebGL counterpart works. I've also tried the WebGL version and it works too despite having some problems with the fonts but that means there is something really wrong with the Web Player build, already disabled firewall just in case but nope, still doesn't work.