I have had the situation on W10, W11 where fldigi would not display the port, and when I typed it, it all worked. AFAIK, the ports were not in use by any app at the time, the installed audio hardware being dedicated to fldigi.
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On 2024-11-24 20:11:, exponent12 via groups.io wrote:
The only unusual thing I ran into is that FLDIGI could not enumerate the com ports and I had to type in COM4 manually.