In some instances, the NIC does not appear within the UI. How can I verify the NIC setup and make it available?

The DLP Network Monitors require a dedicated NIC for monitoring the actual traffic. Occasionally, clients change or add new NICs and the setup must be verified as available and working. 

Please see

High-speed packet capture card for compatibility and requirements. 

To verify whether a NIC is available:

Check DLP UI access as Administrator.
From the left pane, select Administrator > System Overview.
Select the proper server, then select Configure.
Select the new NIC if it is available.
If you do NOT see the NIC as a selection choice within the UI, check the status within Windows device manager:
From the Windows device manager, select
Start > Run > compmgmt.msc > device manager.
Select Network Adapters.
Verify the presence of the card. If the card is not seen on the OS level it will not be available as a choice within the Enforce UI.
If you have the NIC available on the OS level but not as a choice within the DLP UI or Wireshark, re-install the npcap version that was shipped with your version of DLP. In rare circumstances, a re-install with a new UNIQUE monitor name is necessary.