Enabling bluetooth on windows 7

Your Windows device, or the driver for that Bluetooth radio does not support 7 bytes or more encryption key length, then it may have issues pairing when the registry key EnableMinimumEncryptionKeySize is set to a value of 1. Users who have issues connecting their Bluetooth devices after installing and enabling this functionality should check to see if the manufacturer of their Bluetooth controller is providing additional guidance on updates and mitigations. If the policy is enabled and the Bluetooth radio in your Windows device, or the driver for that Bluetooth radio do not support the HCI_Read_Encryption_Key_Size, your Bluetooth devices may no longer work. Note If you are having issues pairing or connecting Bluetooth devices but have not enabled the EnableMinimumEncryptionKeySize registry key or the errors in event log are not the ones listed below, please refer to the Bluetooth troubleshooting tips in KB4507623. Guidance for advanced users and IT Pros If you would like to enable the mitigation for this security vulnerability, you will need to do so manually. This mitigation is off by default. This ensures that peripherals with encryption key size Please note we are shipping this mitigation off by default because during testing of encryption key length enforcement, we found that some Bluetooth controllers may not respond or stop pairing. Some BT devices may not support the minimum encryption key length enforced by the Microsoft update. We understand that compatibility with your devices is important and as we cannot guarantee compatibility with key enforcement enabled. You can enable the mitigation based on your own risk assessment and compatibility needs. If you have access to sensitive data and use the device in an area that does not have physical security, we recommend enabling the mitigation for this security vulnerability. Note Testing is recommended between any hosts and devices you plan to use together with EnableMinimumEncryptionKeySize enabled. We suggest deploying to devices where you have tested the configuration, or Bluetooth usage is not critical to the intended role of the device. Before deploying this mitigation in your environment, we recommended you first test any known devices (see issues below) and that you warn users of potential issues with untested Bluetooth devices. If you encounter issues, you will need to check for updated firmware or drivers for your devices or contact the manufacturer of your device. Issues you may encounter may include: Bluetooth devices may fail to pair or connect

Applies ToWindows 10, version 1903, all editions Windows 10, version 1809, all editions Windows 10, version 1803, all editions Windows 10, version 1709, all editions Windows 10, version 1703, all editions Windows 10, version 1607, all editions Windows 10 Windows 8.1 Windows Server 2019, all editions Windows Server 2016, all editions Windows Server 2012 R2 Windows Server 2012 Summary A security vulnerability has been found in the minimum encryption key length used to establish connections with Bluetooth BR/EDR devices (basic rate/enhanced data rate, also known as "Bluetooth Classic"). To exploit this vulnerability, an attacker needs specialized hardware and is limited by the signal range of the Bluetooth devices in use. When the devices are pairing or connecting, the attacker may be able to interfere and intercept the signal and force encryption key size down to 1 byte, down from the maximum of 16 bytes. This may potentially allow the attacker to decrypt the signal and the personal data within it or hijack the devices themselves. Note Bluetooth Low Energy (Bluetooth LE) devices are not be affected by this issue. For more information about this security vulnerability, see: Mitre: CVE-2019-9506 Microsoft Security Update Guide: CVE-2019-9506 | Bluetooth Encryption Key Size Vulnerability Note At the time of disclosure, we are not aware of this vulnerability being exploited maliciously. Mitigation available on Windows devices To address this vulnerability, on August 13, 2019 Microsoft released a Windows security update (as part of an industry-wide coordination) with a Windows Bluetooth (BT) encryption key size enforcement feature across all supported Windows operating system platforms. This mitigation is off by default and must be enabled via registry key. Customers must enable this functionality by setting a specific flag in the registry. When the flag is set, the Windows software will read the encryption key size and reject the Bluetooth connection if it does not meet the defined minimum key size. If your device does not support the higher-level key length, the update may block connections with that device when the registry flag is set. Previously, the firmware of Bluetooth Classic devices would negotiate and determine the level of encryption for the key length from 1 byte to 16 bytes key length. After installing the August 13, 2019 security update -- and enabling the EnableMinimumEncryptionKeySize registry key -- Windows will reject any Bluetooth connection less than 7 bytes key length. If your Bluetooth device, the Bluetooth radio in

IntroductionA Microsoft Bluetooth Enumerator is a device driver that allows Windows operating systems to recognize and manage Bluetooth devices. Essentially, it acts as an intermediary between the operating system and Bluetooth hardware, facilitating communication and ensuring that peripherals such as keyboards, mice, and headsets function properly. The Bluetooth Enumerator is critical to establishing connections, enabling data transfer, and ensuring compatibility among various Bluetooth-enabled devices. When you connect a Bluetooth device to your Windows PC, the Microsoft Bluetooth Enumerator detects it, installs the necessary drivers, and registers it with the operating system, making it operational for your use.Understanding the Microsoft Bluetooth EnumeratorThe Microsoft Bluetooth Enumerator plays a pivotal role in the Windows Bluetooth architecture. To fully grasp its importance, it is essential to understand some underlying concepts related to Bluetooth technology and device enumeration.What is Bluetooth Technology?Bluetooth is a wireless communication standard designed for short-range connectivity between various devices. It operates on the 2.4 GHz ISM band and supports a plethora of applications, from connecting wireless peripherals to enabling smart home devices. Bluetooth simplifies the process of connecting devices, allowing for data transfer without the need for physical cables.How Device Enumeration WorksDevice enumeration refers to the process by which an operating system recognizes a device, installs appropriate drivers, and allows user interaction. In the case of Bluetooth devices, enumeration occurs when a device is paired with the computer, and the operating system needs to configure it for use. The Microsoft Bluetooth Enumerator is responsible for this enumeration process, ensuring that connected Bluetooth devices are operational.Key Functions of Microsoft Bluetooth EnumeratorUnderstanding the key functions of the Microsoft Bluetooth Enumerator further illustrates its significance in the Windows operating system.Device Detection and ConfigurationWhen a Bluetooth device is brought within range and is put into pairing mode, the Microsoft Bluetooth Enumerator detects it. The enumerator identifies the device’s specifications, categorizes it, and installs the appropriate drivers, which are essential for the device to communicate with the PC.Compatibility ManagementThe enumerator ensures compatibility among different Bluetooth versions and profiles. This often involves managing backward compatibility with older Bluetooth devices, which is crucial for users who rely on legacy hardware.Security and AuthenticationSecurity is paramount in wireless communications. The Microsoft Bluetooth Enumerator participates in the secure pairing process by establishing authenticated connections between devices, preventing unauthorized access and data breaches.Illustrating Practical Knowledge of Microsoft Bluetooth EnumeratorIn practical terms, consider a scenario where you want to connect a Bluetooth headset to your Windows PC. As you enable Bluetooth on your device and set the headset to pairing mode, the Microsoft Bluetooth Enumerator detects this newly available device. It may automatically install drivers from the Windows Update service if required or use pre-installed drivers to connect the device seamlessly.Common Issues and TroubleshootingWhile the Microsoft Bluetooth Enumerator works efficiently under normal circumstances, users may encounter issues from time to time. Below are some common problems and troubleshooting techniques.Device Not RecognizedDriver Issues: Ensure that the drivers for the Bluetooth Enumerator are up to date. Inadequate or corrupted drivers can hinder device detection.Bluetooth Disabled:

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To your Windows Device. The Bluetooth radio in your Windows device may stop responding. You may receive an Event 48 in System event log: Event Log System Event Source BTHUSB Event ID 48 Severity Warning Event Message Text The local adapter does not support reading the encryption key size for a connected device. Insecure devices may be able to connect to this system. You may receive an Event 49 in System event log: Event Log System Event Source BTHUSB Event ID 49 Severity Warning Event Message Text Windows rejected a connection from your Bluetooth device (%2) because the resulting encryption key size was smaller than the system required minimum. Enable key length enforcement using Registry Editor Important Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or view the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Select Start, select Run, type Regedit in the Open dialog box, and then select OK. Locate and select the following registry subkey: HKLM\System\CurrentControlSet\Policies\Hardware\Bluetooth On the Edit menu, select Modify to modify the EnableMinimumEncryptionKeySize registry entry. In the Value data box, type 1, and then select OK. This sets the "EnableMinimumEncryptionKeySize"=dword value to 00000001 Exit Registry Editor. Restart the Windows device. If you do not want to restart your Windows device, you can reset your Bluetooth device instead: On the device, go to the Bluetooth Settings. Turn off Bluetooth. Open Device Manager and locate the Bluetooth Controller. Right-click or long press on the Bluetooth Controller and select Disable device. After the device is disabled, right-click again and select Enable device. Turn on Bluetooth in Bluetooth Settings Frequently Asked Questions Microsoft released security updates on August 13th and customers who enable the security update are protected. The functionality is disabled by default when the update is installed. Users who have issues connecting using Bluetooth devices after installing and enabling this functionality should check to see if their OEM is providing additional guidance on updates and mitigations. The August 2019 Windows Security Update: Determines if the Bluetooth controller supports the HCI_Read_Encryption_Key_Size command. Issues a HCI_Read_Encryption_Key_Size command and tests