Packets are dropped to Bluetooth LE applications in Windows 8.1

Applies to: Windows 8.1 EnterpriseWindows 8.1 ProWindows 8.1


You have more than one Bluetooth Low Energy (LE) application on a computer that is running Windows 8.1. If these applications contend for the same Bluetooth LE device, some packets to the Bluetooth LE applications may be dropped.


Hotfix information

A supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must have Windows 8.1 installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

Bluetooth LE applications usually register for events and also enable notifications when they start. These same applications also disable notifications and unregister for events. This fix does not automatically prevent event notifications from being disabled by one application when other applications are still waiting for the notification events.

To prevent this problem, Win32 desktop software developers should consider opening the Bluetooth LE device by using the exclusive access flag so that one application can lock out other applications from accessing the device.

Applications that are written for Windows 8.1 are prevented from concurrently opening the same Bluetooth LE device. This problem affects only earlier versions of applications.


See the terminology Microsoft uses to describe software updates for more information.