What is Reddit's opinion ofStarTech.com 1 Port PCI RS232 Serial Adapter Card with 16550 UART - PCI Serial Adapter - PCI rs232 - PCI Serial Card (PCI1S550)?
Did you say a USB dongle based COM port? That might be the issue.
You may need a native COM port. I'm not even sure they make these any more. You may need some kind of PCI based Serial card like This
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