Cannot connect/host using Netplay in project M

[arcimine]

Yeah I've tried hosting and nothing, I don't really think it's my computer considering I've never had issues connecting with anything other than the dolphin emulator. If I downloaded directly a rar file with all the files for dolphin 4.0-452 and I didn't actually go through an installer, would that cause the issue? I grabbed the file off of dolphins website.