Please open a case with Digi Support. You can do this by sending an email with details to firstname.lastname@example.org
The problem description in detail, product, serial number, and firmware revision would all be helpful to include.
Digi Technical Support Engineer
Thanks for your response.
Before creating a support case I have to ask my customer for the technical details.
Things I already know:
Digi RealPort Driver Version Version 4.8.488.0, PN 40002549 Rev. H.
OS migrated from Windows Server 2008 R2 to Windows Server 2016
I will come back as soon as I have collected all the details.