# Revision history [back]

### How do I resolve system error 31 ?

This is the first time I am using Wireshark, and only because we have a 10k piece of equipment that doesn't work the way we need it to ... and so I am using it so that the engineer at the company can know what is going on. Problem is, I can't get NPCAP to work properly for me at the moment.

"Local interfaces are unavailable because the packet capture driver isn't loaded. You can fix this by running net start npcap if you have Npcap installed or net start npf if you have WinPcap installed. Both commands must be run as Administrator."

I already have NPCAP 1.0 installed. But when I go to run it in CMD it says the following

"C:\WINDOWS\system32>net start npcap System error 31 has occurred. A device attached to the system is not functioning."

**To further my confusion, I still am collecting some kind of traffic - but unsure what kind. I have two ports - one is "USBcap1" and the other is "USBcap2". But only the former can collect the "traffic" while the other can be clicked only to be returned with "Local interfaces are unavailable" ...

Any direction would be appreciated.

 2 None Guy Harris 19565 ●3 ●496 ●207

### How do I resolve system error 31 ?

This is the first time I am using Wireshark, and only because we have a 10k piece of equipment that doesn't work the way we need it to ... and so I am using it so that the engineer at the company can know what is going on. Problem is, I can't get NPCAP to work properly for me at the moment.

"Local interfaces are unavailable because the packet capture driver isn't loaded. You can fix this by running net start npcap if you have Npcap installed or net start npf if you have WinPcap installed. Both commands must be run as Administrator."

I already have NPCAP 1.0 installed. But when I go to run it in CMD it says the following

"C:\WINDOWS\system32>net start npcap System error 31 has occurred. A device attached to the system is not functioning."

**To further my confusion, I still am collecting some kind of traffic - but unsure what kind. I have two ports - one is "USBcap1" and the other is "USBcap2". But only the former can collect the "traffic" while the other can be clicked only to be returned with "Local interfaces are unavailable" ...

Any direction would be appreciated.

 3 None grahamb 23449 ●4 ●794 ●226 https://www.wireshark.org

### How do I resolve system error 31 ?when trying to start the npcap service on Windows?

This is the first time I am using Wireshark, and only because we have a 10k piece of equipment that doesn't work the way we need it to ... and so I am using it so that the engineer at the company can know what is going on. Problem is, I can't get NPCAP to work properly for me at the moment.

"Local

Local interfaces are unavailable because the packet capture driver isn't loaded.
You can fix this by running  net start npcap
npcap if you have Npcap installed or  net start npf
if you have WinPcap installed. Both commands must be run as Administrator." Administrator.


I already have NPCAP 1.0 installed. But when I go to run it in CMD it says the following

"C:\WINDOWS\system32>net

C:\WINDOWS\system32>net start npcap
System error 31 has occurred. occurred.
A device attached to the system is not functioning." **To functioning.


To further my confusion, I still am collecting some kind of traffic - but unsure what kind. I have two ports - one is "USBcap1" and the other is "USBcap2". But only the former can collect the "traffic" while the other can be clicked only to be returned with "Local interfaces are unavailable" ...

Any direction would be appreciated. appreciated.