Games : Can't make my forge 1.7.10 server public

I've set up the forge server perfectly. Even put the assigned .bat file saying:

!/bin/bash

cd "$(dirname "$0")" exec java -Xmx500m -Xms500m -jar forge-1.7.10-10.13.0.1187-universal.jar

in the folder. yet, My friends can't connect. The heck!