I solved my problem on my own!
After installing WinPcap 4.1.3 once more, I got tons of the following errors:
failed to set hardware filter to non-promiscuous mode
This error brought me to the following:
I only have a wifi networkcard on my OH2 server (Win 10, 32 bit):
Then I tried the following alternative pcap:
I installed it with “WinPcap 4.1.3 compatibility” and “Raw 802.11 Packet Capture”.
Now it is running…