Windows may try to assign it to a COM port already in use. When we talk about these types of problems, here are some related problems that have been reported by users: Problems with a serial port can be very annoying, especially if you tend to use the serial port frequently. This can be a big problem, and in today’s article we will show you how to solve it. How to Fix: Unable to open serial port error messageĪ serial port may be useful, but some users have reported that the serial port message cannot be opened on their PC. Windows putty unable to open serial port.Run a System Scan to discover potential errors.Disable the serial port in Device Manager Verify that the port isn’t open/disconnect the cable Make sure that you have the necessary drivers
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