BrowserPrint not printing

Hi,
We have a problem with Browser Print.
It was working a few weeks ago and it stopped (it was used for long time so no idea when it stopped).

 

The browser is doing request to POST https://localhost:9101/write with data:

{"device":{"name":" 28J164902920","uid":" 28J164902920","connection":"usb","deviceType":"printer","version":2,"provider":"com.zebra.ds.webdriver.desktop.provider.DefaultDeviceProvider","manufacturer":"Zebra Technologies"},"url":"https://easypost-files.s3-us-west-2.amazonaws.com/files/postage_label/20170809/425c9ec7b8d74d6c8519bdda47465835.zpl"}

We are getting back status code 200 so it should print.

Is there any way to debug why it is not printing?

 

We can print via the system to this printer.