![SOLVED] INAV Failed to open serial port on WINDOWS · Issue #726 · iNavFlight/inav-configurator · GitHub SOLVED] INAV Failed to open serial port on WINDOWS · Issue #726 · iNavFlight/inav-configurator · GitHub](https://user-images.githubusercontent.com/45081450/87424772-d37ec900-c5dc-11ea-8f40-4dd6163a067d.png)
SOLVED] INAV Failed to open serial port on WINDOWS · Issue #726 · iNavFlight/inav-configurator · GitHub
![All of a sudden BetaFlight: Failed to open serial port, when trying to repair ImpulseRC: the port 'COM7' does not exist. And I can see COM 7 in BetaFlight right now. FC All of a sudden BetaFlight: Failed to open serial port, when trying to repair ImpulseRC: the port 'COM7' does not exist. And I can see COM 7 in BetaFlight right now. FC](https://preview.redd.it/806jxpy9d7d41.jpg?auto=webp&s=f8a6f34a322976860eb606f5dfa90a5d2dc71e5d)
All of a sudden BetaFlight: Failed to open serial port, when trying to repair ImpulseRC: the port 'COM7' does not exist. And I can see COM 7 in BetaFlight right now. FC
Resolving error "(4088) The license server manager (lmgrd) failed to open the TCP/IP port number" in Mapinfo Service
![Intelli J IDEA Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed" - Stack Overflow Intelli J IDEA Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed" - Stack Overflow](https://i.stack.imgur.com/yLX8Q.png)
Intelli J IDEA Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed" - Stack Overflow
![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-serial-port-in-device-manager.png)
Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
Unable to launch the license server. Server log shows "(lmgrd) Failed to open the TCP port number in the license." | AutoCAD | Autodesk Knowledge Network
![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-selection.png)