Bluetooth stack inserts invalid COM port names into registry

Hi,

Welcome to Microsoft Community and thank you for your interest in Windows 10.

I suggest you to update the Bluetooth driver or update it from the manufacturer’s website sand check if it helps.

We recommend not to change any settings in registry.

DISCLAIMER: Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 (http://support.microsoft.com/kb/322756/ )

Hope this information was helpful and do let us know if you need further assistance. We will be glad to assist.

Can you detail the steps to fix this manually?  When you make the fix does it keep the change after re-boot?  I was having problems probably caused by this using the Windows 10 BT Stack.  I removed it an now I'm using the Toshiba Stack.  I would rather go back to the windows version as the Toshiba fix adds a lot of extra features I don't need.  Thanks in advance.  :)

Hi,

I suggest you to update the Bluetooth driver or update it from the manufacturer’s website sand check if it helps.

We recommend not to change any settings in registry.

:

Hope this information was helpful and do let us know if you need further assistance. We will be glad to assist.

The drivers are all up to date as at 11 February on Windows 10 x64 10586.104.  This is the MICROSOFT Bluetooth stack, so you can't fob this bug off on anyone else.

This is the code that gets the port names:

       foreach (string s in System.IO.Ports.SerialPort.GetPortNames())

       {

           comboBoxComPort.Items.Add(s);

       }

So they are corrupt as returned by the system APIs.

So, again, please fix this.

Dave

Use regedit on the REGSZ value called "PortName" under registry Keys like:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\BTHENUM\{00001101-0000-1000-8000-00805f9b34fb}_LOCALMFG&0000\8&2e8757f5&0&000000000000_00000000\Device Parameters

If there's no entry for PortName, than move to the next registry section under BTHENUM.

The value for PortName will appear correct, but it actually isn't correct in the registry hive, so just open it, change it, then change it back to what is was (e.g. COM4).

Do this for all COMnn entries under BTHENUM

This is entirely at your own risk, make sure you have a registry backup before starting.

It does however resolve the problem.