Answer by Stefan Michev for How can I access my localhost from my Android device?

What worked for me ( target: debug an windows server app running on localhost:99999 from an client app running on android phone )

1. phone and pc connected on the same network e.g. 192.168.1.xxx ( connected via wifi in my case)
2. enable port 99999 in windows firewall
3. run in cmd as administrator: netsh http add urlacl url=http://*:99999/ user=Everyone

then the service app url (my_dev_machine_ip:99999/path_to_service) was accessible from the phone.