Closing Serial Monitor does not release the Serial port

Development Tools IDE 2.x
1

Windows 10
Using a clone Nano board on COM9 but the same problem occurs using a Uno R4 WiFi on COM43

Using IDE 1.8.19 I can connect an external terminal program such as PuTTY to COM9 to see Serial output from a sketch as long as the Serial monitor is not open

However, using IDE 2.3.2 I cannot connect to COM9 using PuTTY whether or not the IDE serial monitor is open and have to resort to selecting a different COM port in the IDE to allow an external connection to be made

I am not sure, but I don't remember this being a problem in previous 2.x versions of the IDE

Am I missing a trick here ?

2

Not an expert on arduino (not even close). Just an idea but if your connections are usb maybe in newer versions of IDE it requires newer versions of usb. usb-c usb 3.0 etc. Usb drivers should take care of something like that but maybe worth looking into I've had problems with peripherals for this exact reason.

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