Com port transmission stopping in windows 10

[Rodney Bateman]

Hi, I hope someone here can help me.I work for a company that uses a RS485 to transfer a program to a circuit board.We have found since swapping most of our machines to Windows 10 that we can no longer transmit these programs.I have installed a port sniffing tool and found that when the program sends an exclamation mark (!) the port will stop transmitting.This problem is not found in windows 8.1 or earlier. We have also found that if we run the software inside a virtual PC the port still works, so its not a hardware issue.I have also tried a Windows 11 machine and found the same problem exist

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