Some additional information on this:
The WMI Network issues only started once going from free/trial edition to the paid edition where I had to install the paid edition of PRTG software.
I've also added a new probe to a brand new network, server is only 3 months old running server 2012r2. Same WMI network sensor problem. I've also tried temporarily disabling windows firewall, still the same problem occurs. The server has also been rebooted along with the external PRTG monitoring server.
The correct windows credentials are being used, and also the PRTG WMI tool can read WMI information without a problem.
.NET Framework 4 is installed as well.
See below for error when adding WMI Network Sensor:
Failed to find valid network cards. Interface names ['WAN Miniport [IP]','WAN Miniport [IPv6]','WAN Miniport [Network Monitor]','Microsoft Kernel Debug Network Adapter','Broadcom NetXtreme Gigabit Ethernet','Broadcom NetXtreme Gigabit Ethernet _2','Intel[R] Gigabit 2P I350-t Adapter','Intel[R] Gigabit 2P I350-t Adapter _2','Local Area Connection* 1','Local Area Connection* 2','Local Area Connection* 3','Local Area Connection* 4',isatap.<3F9E4A04-4F91-44ED-91FC-81B6A63FC935>,'Local Area Connection* 11'] WMI Table [Win32_PerfRawData_Tcpip_NetworkAdapter]
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