packetsendpacket failed: A device attached to the system is not functioning.(31)

[ontheroad530]

Describe the bug
An error occurred in the customer usage scenario, remote debugging:
1.pcap_sendpacket error:
packetsendpacket failed: A device attached to the system is not functioning.(31)
2.I can capture this packet in wireshark still
3.but I can't capture response packet from other device for this packet. I can't do any further debugging...

To Reproduce
I run the test demo (sendpack) and still got the error

Diagnostic information
Npcap 1.79 used, 1.80 used
try Npcap 1.60, no send error,but still can not receive packet from device.

Additional context
in other envirment, this work fine.

[guyharris]

packetsendpacket failed: A device attached to the system is not functioning.(31)

31 is ERROR_GEN_FAILURE; I suspect "GEN" stands for "generic", as in "some unspecified thing went wrong".

One NT status value that maps to ERROR_GEN_FAILURE, according to the NTSTATUS to Win32 Error Mappings table, is STATUS_UNSUCCESSFUL. That's returned from the NPF driver in several places.

I can capture this packet in wireshark still

Is Wireshark running on the machine on which you tried sending the packet, or on another machine on the network?

[ontheroad530]

packetsendpacket failed: A device attached to the system is not functioning.(31)

31 is ERROR_GEN_FAILURE; I suspect "GEN" stands for "generic", as in "some unspecified thing went wrong".

One NT status value that maps to ERROR_GEN_FAILURE, according to the NTSTATUS to Win32 Error Mappings table, is STATUS_UNSUCCESSFUL. That's returned from the NPF driver in several places.

I can capture this packet in wireshark still

Is Wireshark running on the machine on which you tried sending the packet, or on another machine on the network?

Wireshark was running on the machine I was sending packets from
The error occurred at the remote customer site and I could not debug it further (i.e. can't capture packets on another machine on the network).

[guyharris]

Wireshark was running on the machine I was sending packets from

So the packet was probably being wrapped around by the Npcap code before it tried to send it, but, when it tried to send it, that failed.

It might be easier to debug if, in at least some cases, the Npcap driver returned a status other than STATUS_UNSUCCESSFUL, to indicate a particular error.

[ontheroad530]

Wireshark was running on the machine I was sending packets from

So the packet was probably being wrapped around by the Npcap code before it tried to send it, but, when it tried to send it, that failed.

It might be easier to debug if, in at least some cases, the Npcap driver returned a status other than STATUS_UNSUCCESSFUL, to indicate a particular error.

thanks, I guess it was not sent success yet