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Topic # 97172 13-Feb-2012 00:42
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I have a custom program running on a desktop machine that communicates with a modem, with a USB to serial port cable.

Randomly, I'll get this error: Access to the port 'COM9' is denied.

I thought it was the user unplugging or moving the cable but it's now securely fixed and still keeps happening.  Is there an option in XP that I need to set/unset?

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Ultimate Geek
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  Reply # 580640 13-Feb-2012 00:52
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Checking in Device Manager, is that the correct port for the modem?

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