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HF Auto Running in Parallels getting COM Port Access Denied Message


I have intermittently had the problem of getting a "Port COM3 - Access to the Port "COM3" is Denied" message when trying to connect to the HF Auto Tuner using the W1TR HF Auto Software running in Windows 10 under Parallels. Yesterday the problem returned and I cannot connect to the HF Auto Tuner using the W1TR Software. Has anyone else had this problem? It is maddening. I have re-installed HF Auto, have re-installed the FTDI driver, disabled and re-enabled the driver, have unplugged and reconnected the USB cable, all to no avail. All suggestions appreciated.

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