I tried to sync it on a friends home with open firewall but it doesn't work too. 0 connection.
I tried it with the windows GUI wallet and the headless linux version.
Kind regards
As a career troubleshooter I would ask you to allow it a full day on your friends "no firewall" machine
Also to copy my pasted config files and place them in the right folder.
The wallet works fine, we have 9 connections generally, so it's on your end. Keep us posted as to what you try! I suspect your config files are off.
edit
Simple logic asks to have your friend try the wallet on his machine. That will tell you if it ALSO fails the same conditional test, then suggesting it's probably your config files on both machines that have wrong info.