Windows 10: Cannot open the com port

Discus and support Cannot open the com port in Windows 10 Support to solve the problem; I am using the program STM32Flasher from this link: FLASHER-STM32 - STM32 Flash loader demonstrator (UM0462) (replaced by STM32CubeProgrammer) -... Discussion in 'Windows 10 Support' started by 3DPiper, May 4, 2021 at 3:57 AM.

  1. 3DPiper Win User

    Cannot open the com port


    I am using the program STM32Flasher from this link: FLASHER-STM32 - STM32 Flash loader demonstrator (UM0462) (replaced by STM32CubeProgrammer) - STMicroelectronics When I run it, it correctly finds the only used com port. But when I click Next, I always get the error "cannot open the com port, the port may be used by another application' THis is from a clean boot, how do I see what else is using the port? In the device manager it is the only listed com port

    :)
     
  2. spapakons Win User

    USB Port Oddities


    Ok, let's see it with pictures step-by-step. First right-click on the USB device and select Update driver software:


    Cannot open the com port [​IMG]


    Then select Browse my computer for driver software (LAST option) :


    Cannot open the com port [​IMG]


    The select Let me pick from a list of device drivers on my computer (LAST option) :


    Cannot open the com port [​IMG]


    Then select the standard driver from the list and click next:


    Cannot open the com port [​IMG]


    Click next/OK as required to complete installation. Repeat the steps for all Intel USB devices. Finally click on each USB root device and press DEL to delete it, reply YES when asked. After deleting all USB root devices restart the computer.

    I hope this is detailed enough...
     
  3. Junaid_A Win User
    Port is being blocked

    Hi,



    Thank you for writing to Microsoft Community forums.



    • Are you aware of any changes that happened on the computer prior to this issue?


    Upon researching, this seems like an issue due to the port scan. You may want to try the steps listed below and check if it works.

    • Login to your Netgear
      NX6200 Extender GUI
      .
    • Click on Advanced tab and choose
      WAN Setup
      .
    • Check the box for Disable Port Scan and DoS Protection.
    • Allow it to update and check if the port is still being blocked.


    However, if the issue persists, I suggest you to post your query in the
    TechNet Forums, where we have support professionals
    equipped with knowledge on port forwarding.



    Regards,
     
  4. Cannot open the com port

    ISP Blocking Port Forwarding Conspiracy???

    I've come across a few posts that suggest that some cannot open/forward ports from their modem. It's been suggested that it's a direct result of ISPs trying to crack down on torrenting. However, I am not sure how true this is. Is there a way to test this? Is there a way to see if a port is forward on your modem if it's open or not?
     
    EastCoasthandle, May 4, 2021 at 4:03 AM
    #4
Thema:

Cannot open the com port

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