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Topic: port access denied? (Read 292 times) previous topic - next topic


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avrdude: ser_open(): can't open device "\\.\COM5": Access is denied.


Are you sure that's the COM port of your Arduino? If so, try restarting your computer. Sometimes the port gets stuck open.


I had same error - my UNO was plugged into a USB hub.. i plugged directly into Motherboard and it solved the problem for me.



Unpowered hubs or CHARGE only hubs can be a common issue.
Good quality POWERED USB 2.0 hubs tend to work very well .

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

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