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I suspect that dumpcap's capture loop is not working due to some limitations of WinPcap-NT, e.g. it may not offer a HANDLE on which WaitForSingleObject()/WaitForMultipleObjects() work. It may thus mean that dumpcap blocks indefinitely waiting for packets and thus never notices that the timeout expires.

This is probably best handled initially as a Wireshark bug, so please file a bug on the Wireshark Bugzilla. We may have to talk to Napatech about making changes to WinPcap-NT (including turning it into Npcap-NT!), so if you can find a technical contact at Napatech with whom we can talk about WinPcap-NT, that would be helpful. ("We" will probably end up meaning "me along with Daniel Miller of Npcap".)