@entdgc 

I would first reach out to your ISP to make sure no ports are being filtered. If not, try changing the ports to completely values such as 1000 or 2000 jfor HTTP, save and then test with a port checker you can find on google.

were you able to fix it? I'm having a similar issue and I'm don't know what else to do

@entdgc 

No I haven't fixed it because I have found FTP works perfectly for my use case. I need to be able to send large files to my son-in-law who is a competent technical user of IT (but nothing more) and runs Mac's. He now simply mounts the FTP site as a disc on his Mac and can download large files quite quickly. I will investigate HTTP again just to satisfy my curiosity when I get time. If I find a solution I will post back here.