Error with Microsoft SQL v2 Sensor

Hi,
Please try creating a result file for said sensor. You can do so on tab Settings of the sensor by setting option Sensor Result to Write sensor result to disk (Filename: "Result of Sensor [ID].txt"). File will be stored in the PRTG Data Directory in folder Logs (Sensors). Either post the contents here or forward the file to support@paessler.com referencing this thread.
Best regards

Looks like I'm getting a .NET Unhandled Exception.

Unhandled Exception: System.ComponentModel.Win32Exception: The operation completed successfully
   at MS.Win32.UnsafeNativeMethods.RegisterClassEx(WNDCLASSEX_D wc_d)
   at MS.Win32.HwndWrapper..ctor(Int32 classStyle, Int32 style, Int32 exStyle, Int32 x, Int32 y, Int32 width, Int32 height, String name, IntPtr parent, HwndWrapperHook[] hooks)
   at System.Windows.Threading.Dispatcher..ctor()
   at System.Windows.Threading.Dispatcher.get_CurrentDispatcher()
   at System.Windows.Application..ctor()
   at SQLSensorAdv.App.Main()

Just checked with the developer but as the sensor has changed so much over the last months the message you are getting might be a bug in the version of PRTG you are using. You might either update to a current version or you might use the 'old' MSSQL sensor here.
Best regards

So we have paid for our support and upgraded to version 16.3.24.4980+ we are still experiencing the same error message but this time its very sporadic.

Unhandled Exception: System.ComponentModel.Win32Exception: The operation completed successfully
   at MS.Win32.UnsafeNativeMethods.RegisterClassEx(WNDCLASSEX_D wc_d)
   at MS.Win32.HwndWrapper..ctor(Int32 classStyle, Int32 style, Int32 exStyle, Int32 x, Int32 y, Int32 width, Int32 height, String name, IntPtr parent, HwndWrapperHook[] hooks)
   at System.Windows.Threading.Dispatcher..ctor()
   at System.Windows.Threading.Dispatcher.get_CurrentDispatcher()
   at System.Windows.Threading.DispatcherObject..ctor()
   at System.Windows.Application..ctor()
   at SQLSensorAdv.App.Main()

It will work for days on end with maybe 1 or 2 downs but it seems to be coming more frequent the more sensors we add.

Please help.

I'll forward this to our developers so they can check it. They'll let you know if they need more info.

Hi,
what OS is PRTG running on and what .NET versions are installed there?

PRTG is installed on Windows Server 2012 R2 x64 with .NET 2.0.50727, 3.0, 3.5 & 4.5.2 (4.5.51650)

How much SQL sensors do you have added and are they all located on the same probe? You also could forward us a Support Bundle using the contact support ribbon in your installation. When doing please refer to this thread.
Thank you!

The sensors are setup on a local probe with multiple devices. The strange thing is that I have the MSSQL WMI sensor working flawlessly across all these devices. The majority of devices have 2-3 MSSQL sensors and not all the sensors on the device fail and not all the time. I have sent a screenshot of such to your support email.