I recently installed Typesafe Activator to a VM. Applications created by activator can be accessed after port forwarding, but Activator seems to listen localhost. How to change
It looks like setting system properties http.address and http.port will now do this job, e.g.
http.address
http.port
./activator -Dhttp.address=0.0.0.0 -Dhttp.port=80
Would launch Activator on a WAN on port 80 (assuming matching permissions, etc).