How to free COM ports on windows?

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After port com999 mission planner not see com port 1000 and more. He see com100 and not connect. Where saving this ports? i need clear all 999 ports then it start com1… Where that cashe??? Thanks for answer/

Go to Device Manager and click “Ports (COM & LPT)”, then right click the port you want to change. In the context menu choose “Properties” and in the Properties dialog select the “Port Settings” tab, then click “Advanced”. Using the “COM Port Number” dropdown select the new port you want to use, this will most likely then override a previous assigned port, but works for me.

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