Troubleshooting BMC Discovery Outpost Nmap port scan failure
Port scanning from the BMC Discovery Outpost fails with the error: Error compiling our pcap filter: expression rejects all packets
The issue is being tracked by the Nmap developers as issue 2381.
You can workaround this error by disabling the Npcap loopback adapter. To do so, use Control Panel > Network and Internet > Network and Sharing Center > Change adapter settings
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