If using WatchMon Toolkit make sure that you are connecting via USB. USB symbol will be in the status bar
Wifi is read only and hence a pin number will not get you in. It is possible to have a USB cable plugged into the WatchMon and still be connected via Wifi
So check status bar to be sure.
Attempt Method 1
Where Dinrails are used you may need to remove from the holder to see the back of the device and double check we didn't have a dyslexic moment when doing the label.
If you have changed the pincode it is important you keep a record of the new number.