With Windows 10, can't open any Bluetooth virtual com ports

Bluetooth virtual com port not openable in Windows 10. Last worked in 8.1.

Symptom:
I am an application developer and have tried my application on two computers I just upgraded to Windows 10 (an Acer W510 tablet [formerly win 8.1] and a Dell Precision M6600 [formerly win 7]).

Our devices use a serial port (SPP) service on Bluetooth.  Windows automatically creates the serial ports when pairing the devices.  The devices pair well and the necessary virtual serial ports are created.  They all look great but on both computers, no software is able to open the serial port.

(I must say:  I do like Windows 10 even though I have already seen a "blue screen".)

tried:

- my commercial software

- a test application written in Visual Studio Express 2013

- a test application written in Delphi

- terminal software that would open a serial port and talk with the device

the serial port connection can't be opened due to an error  1168 (ERROR_NOT_FOUND) in CreateFile( ).

As I said, this affects both machines that I upgraded to the official release of Windows 10.

POSSIBLE CAUSES:
Security/permissions? Turned off UAC (user account control); still doesn’t work. User account is Administrator. Tried a new Administrator account (possible account corruption?): no improvement.

Might this be part of a new “windows store” expectation where applications must declare the operating system features they intent to use? This would be a little bit strange since it allowed pairing/unpairing with code. Change to application manifest?

Security/firewall? Turned off firewall; still doesn’t work.

Is the radio off as some kind of power-saving feature? Having trouble determining whether this is the case. One would think that if one attempted to open such a serial port, it would turn on the radio as needed. tried also a laptop not having built-in bluetooth (really!); using external BT dongle, see BT module indicator is blinking (suggesting it is powered-up and operational).

Add something to the application manifest?

Is the com port busy? shouldn't be.  besides, then it should say that the port is in use or “access denied”.

Any “allow windows to turn off the device to save power” features are turned off on relevant devices.  no improvement.

Acer W510 Device manager shows some motherboard features (nothing to do with USB/bluetooth or our devices) that may not have suitable device drivers. the Dell laptop has no Device Manager issues (but has the same inability to use the virtual com port) suggests that these driver issues are not "the" problem.

“Allow Bluetooth devices to find this PC” is not helpful.

“Bluetooth Smart”, “Bluetooth Smart Ready” feature may be implicated in this but don't know enough about them.

using "Developer mode" provided no insight.

using compatibility mode was no help either.

starting to think maybe the driver provided by Windows is not compatible with the Bluetooth hardware in the device.

other people experiencing this problem:  can you leave a comment here about any of your findings?

 

Question Info


Last updated September 9, 2019 Views 25,428 Applies to:

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Same problem, it seem that the port is looked in use by another app. So that it can't be opened once again. I think off a bug, i too have many time saw the blue screen.

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Hi Mike,

Thank you for posting your question on Microsoft Community.

I suggest you to post your query in MSDN forum so that they can assist you better:

https://social.msdn.microsoft.com/Forums/en-US/home?forum=wpsubmit&filter=alltypes&sort=lastpostdesc

Please get back to us for future support, we’ll be glad to assist you further.

Thank you.

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thank you; I have but there was no reply or comment about this burning problem.

https://social.msdn.microsoft.com/Forums/en-US/3cc7aa0b-cfdb-4e14-a6b1-ace3037f1031/with-windows-10-cant-open-any-bluetooth-virtual-com-ports?forum=windowscompatibility

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I have same problems.

PC : Toshiba VT-484 tablet.
GPS : Transystem 747Pro (bluetooth is not available, but USB connect is OK)

And I tried old GPS (Wintec wbt-100).
It is running normally.
What is problems?

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Same problem here.

Windows 10 can not open a virtual com port created by a bluetooth device. This worked fine in XP, Vista, 7, 8 and 8.1.

Please fix ASAP.

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same issue here!

Please Microsoft, solve It.

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Same.

Pairing a Bluetooth Device that supports BT-SPP Profile, Windows 10 is automatically adding incoming & outgoing Virtual Com-Ports to the system (this step is a success).

Incoming COM port works but Outgoing port fails to open the virtual COM port (tried with many applications and drivers [bluetooth and COMM).

Due to problems in Windows 10 handling virtual serial ports with class SPP it's unfortunatelly not as straight forward as it has been with Windows 7 / 8.

If you're writing your own applications for Windows 10 you simply use the class "RFCOMM" instead of "SPP" to communicate with the bluetooth device and then you bypass the error.

Or use an external Serial - Bluetooth adapter

Or wait until Microsoft fixes this problem

Jean-Louis

Jean-Louis

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Same problem with Qstarz BT-Q818XT bluetooth receiver.  SPP outgoing com port not accessible. Only usb works. This problem exists on different laptops using different bluetooth chipsets and drivers.  Clearly a Windows 10 issue which Microsoft needs to address immediately!
...
I am NOT a Microsoft employee

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Yes, same problem here with my Qstarz Bluetooth GPS logger. Because Microsoft don't bother to fit a GPS chip into their Surface devices, I need to use a GPS logger to feed GPS data into mapping applications. This worked under Windows 8.1. It doesn't under Windows 10. Honestly, Microsoft are their own worst enemy at times...

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Hi,

I apologize for the inconvenience caused.

I suggest you to try installing the Qstarz Bluetooth GPS logger driver/software in compatibility mode and check if it works for you. This is to check if this is caused due to any driver/software compatibility.

Refer to the following Microsoft Help article to install driver/software in compatibility mode, the steps for Windows 8.1 applies to Windows 10 as well.

http://windows.microsoft.com/en-US/windows-8/older-programs-compatible-version-windows

Please feel free to visit our website for any help with Windows Operating System.

Basith M
- Forum Moderator (Multiple Forums)

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