12/18/2023 0 Comments Cakebrew invalid active developer pathIn the Advanced Settings window select a new COM Port Number:Ĭlick OK and close all Device Manager windows. In the Port Settings tab click the Advanced button:ĥ. ![]() In the Properties window first click Change settings to switch to administrator mode, then navigate to the Port Settings tab:Ĥ. Right click your COM port and select Properties.ģ. Open Device Manager and navigate to the Ports (COM & LPT) section (see the screenshot above).Ģ. If none of the above works you can rename the port, and most of the time this is what fixes the issue for me.ġ. a printer, a vinyl cutter or a 3D printer? Apps and drivers for other devices: Do you have other devices connected to your computer via USB or Bluetooth, e.g.Terminal monitors: Do you have a terminal monitor connected? Sometimes they are separate apps (like Termite) or built into code editors (like in Arduino IDE or in Visual Studio Code).Code editors: Do you have other open Arduino IDEs, Visual Studio Code instances or apps that you use to create and upload your code open?.In my experience the following apps are often causing this problem: ![]() For example some Bluetooth drivers are reported to lock COM ports even before a device is connected. Basically any app can be the culprit that communicates with devices, and unfortunately not only apps, but device drivers also. Unfortunately I’m not aware of any tools that could list which app is locking a particular port (if you do, please share in the comments), so you have to think. Try to close any programs that may use this port. The Arduino IDE is quite good to detect connected devices, but in case you have multiple devices connected at the same time this is definitely worth to check: Open Arduino IDE and check in the Tools –> Port menu that you are trying to upload to the port you have seen in the Device Manager. Tip #2: Check your port in the Arduino IDE ![]() Note the number of the port (in my case COM4): Open Device Manager and check that your IoT device appears in the Ports (COM & LPT) section. Tip #1: Check your port in Device Manager It is important to understand that this error has nothing to do with Arduino, the access to the serial ports are controlled by the operating system. The number of the serial port can be different, but the error is the same.īasically (in simplified form) this error means that the USB port is in use by another application in your computer, so the Arduino IDE cannot use it to upload your sketch. I’m sure that everyone who has ever tried to upload a sketch from the Arduino IDE has seen this error message: avrdude: ser_open(): can't open device "\\.\COM4": Access is denied.
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