Public link image not shown after docx to pdf conversion on windows server 2012 r2

Hello people,

We have third party tooling installed on our windows server which converts a docx file to pdf. The docx file contains a link/public url image, but the converter is not able to download the image from the internet and place it in the pdf. Does somebody know of a security/firewall setting in Windows Server 2012 r2 which is blocking this process?

Looking forward to your reactions.

Kind regards,

Tijs