on unix based systems you need root level permissions to bind a server to a port <1024
you don't have root
so wherever you're setting that port, try setting it to something >1024 and <65535
if it works then, and you can access the resource on that port, leave it there and don't change it again because it isn't gonna work
no really you can't set it to less than 1024
wait what the forget are you doing again
disabling http and trying to make a ftp server? does it even have an option for a ftp server?