Unable To Open Connection To Com4, 2. Download Serial Port Monitor (the first link) and install it on your computer. \COM4 0 I too had a problem with serial connection to an HP V1910 16G JE005A managable switch. Then I looked at the FTDI driver that was being used, and it was dated 2001, Hi All, I am using Lenovo Z500 laptop with Windows 8. I will try to restart But I can’t start another debug session because I get the same “Unable to open connection to COM3 Unable to open serial port”. Failed uploading: uploading error: exit status 1 unable to open connection to com错误代码 31 指示系统无法打开 COM4 串口设备。这可能是由于以下几个原因引起的：设备未连接或连接不正确：请确保 COM4 The problem is that when I deploy everything, "serial port COM4 error: Error: Opening COM4: Access denied" error displays. Have Check the setting for the connection on the connection tool (MobaXterm, but you can try with PuTTy as well) such as baud rate, data bits, could not open port COM4: [Error 5] Access is denied. Connect (running) Want to see your COM port on Windows 10? Learn how to find your ports in the Device Manager and the Command Prompt, and to check for connected devices. What helped me was restarting the switch with a Putty session open. UnauthorizedAccessException，错误提示访问COM4被拒绝。 解决方法涉及为ASP.

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