Windows 10: COM Port Overflow

Discus and support COM Port Overflow in Windows 10 Drivers and Hardware to solve the problem; Hi, I recently came into a curious issue where I apparently exhausted all available COM ports. Now, every time a new device is connected to the... Discussion in 'Windows 10 Drivers and Hardware' started by Chelsey Smith, Jan 15, 2020.

  1. COM Port Overflow


    Hi,

    I recently came into a curious issue where I apparently exhausted all available COM ports. Now, every time a new device is connected to the machine, COM0 is used. I assume a Y2K like issue arose after it assigned COM4096 and began an overflow to COM0... which apparently does not/should not exist.


    Using a utility, I was able to uninstall the phantom devices ranging from ~COM50 through COM4096. However, I was unable to remove the 100+ COM0's that exist as the utility throws an error.

    COM Port Overflow 351f7317-25d7-4f5b-9fde-1a9ecbe29261?upload=true.png



    I then tried manually uninstalling the devices in the Device Manager... it appears to work, but does not remove the device.


    Changing the COM port from 0 to any valid number, also does not work. In fact, it crashes the Device Manager...



    Anyone help/advice would be appreciated.




    Thanks,

    Chelsey Smith

    :)
     
    Chelsey Smith, Jan 15, 2020
    #1
  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:


    COM Port Overflow [​IMG]


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


    COM Port Overflow [​IMG]


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


    COM Port Overflow [​IMG]


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


    COM Port Overflow [​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...
     
    spapakons, Jan 15, 2020
    #2
  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,
     
    Junaid_A, Jan 15, 2020
    #3
  4. Mishima_ Win User

    COM Port Overflow

    sihost.exe BUFFER OVERFLOW

    I am having major issues with my sihost.exe process running on my local after upgrading from Windows 8 to Windows 10. After examining the errors on my pc, I see sihost showing BUFFER OVERFLOW result when attempting to RegQueryValue on Cortana values. My
    start menu is unresponsive and things such as opening File Explorer are taking an incredibly long time. I haven't attempted a system restore from safe mode but this is my next step.

    Example:

    Operation: RegQueryValue

    Result: BUFFER OVERFLOW

    Path: HKCU\Software\Classes\Extensions\ContractId\Windows.BackgroundTasks\PackageId\Microsoft.Windows.Cortana_1.4.8.176_neutral_neutral_cw5n1h2txyewy\ActivatableClassId\CortanaUI.AppXd4tad4d57t4wtdbnnmb8v2xtzym8c1n8.mca\Description
     
    Mishima_, Jan 15, 2020
    #4
Thema:

COM Port Overflow

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