![Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it. Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.](https://gyorgybalassy.files.wordpress.com/2020/10/arduino-port-advanced-settings.png)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
![ESP32 & could not open port 'COM5': PermissionError(13, 'Access is denied.', None, 5) - espressif32 - PlatformIO Community ESP32 & could not open port 'COM5': PermissionError(13, 'Access is denied.', None, 5) - espressif32 - PlatformIO Community](https://community.platformio.org/uploads/default/original/2X/b/bd7659971b80c6b291c18cd8e7356c73ea50bb62.png)
ESP32 & could not open port 'COM5': PermissionError(13, 'Access is denied.', None, 5) - espressif32 - PlatformIO Community
![Can't upload to Pro Mini. Port access is denied - Avrdude, stk500, Bootloader issues - Arduino Forum Can't upload to Pro Mini. Port access is denied - Avrdude, stk500, Bootloader issues - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/c/7/4/c740abf868f5e7a91e707ad8ca5c0ba2bded909b.png)
Can't upload to Pro Mini. Port access is denied - Avrdude, stk500, Bootloader issues - Arduino Forum
![Unable to connect to COM5: could not open port 'COM5': PermissionError(13, ' Access is denied.', None, 5) · Issue #2315 · thonny/thonny · GitHub Unable to connect to COM5: could not open port 'COM5': PermissionError(13, ' Access is denied.', None, 5) · Issue #2315 · thonny/thonny · GitHub](https://user-images.githubusercontent.com/25057585/173126063-fb5a0bde-4a26-48bc-844d-7ca33bb11429.png)
Unable to connect to COM5: could not open port 'COM5': PermissionError(13, ' Access is denied.', None, 5) · Issue #2315 · thonny/thonny · GitHub
![Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it. Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.](https://gyorgybalassy.files.wordpress.com/2020/10/arduino-port-properties.png)