Situation: The client has a Dell R440 server running Windows 2016. The server has 4 NICs. However, they can’t see one of NICs when they create NIC team.
SLOT 2 Port 1-LAN is missing.
Troubleshooting: After checking the Properties of the SLOT 2 Port 1-LAN, we find the Hyper-V Extensible Virtual Switch is checked. Unchecked it fixes the problem.