One possible reason is because nothing is listening on port 80 on the device.

Product support balenaOS
1

Hello,
Can you help me to config an error as “One possible reason is because nothing is listening on port 80 on the device” when I click the public device URL?
Regards,
Thien Nguyen

2

Hi Thien,

That error message says that while the public URL feature has been correctly enabled and it received your requests, the application running in your balena device is not binding to port 80, and therefore there is nothing ready to handle the request on the other side.

What application are you pushing to your device? Are you sure that its listening on port 80?