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Interfaces not available after upgrading to 3.6.7

asked 2022-07-28 10:25:57 +0000

Magicbean gravatar image

I have just upgraded my software to 3.6.7 on Windows 11 Pro.

When I ran WireShark, I get the following message: 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.

When I ran WinPcap by typing 'net start npf' in an administrator cmd window I got the result ''The service name is invalid. More help is available by typing NET HELPMSG 2185."

NET HELPMSG 2185 only tells me that "The service name is invalid."

I then installed the latest version of npcap for Windows (1.70) manually and restarted the PC. When I start WireShark, I no longer get the message about Local interfaces being unavailable, but I only see Adaptor for loopback, USBPcap1 and USBPcap2. If run 'net start npf' it tells me that the service is already running.

I then tried uninstalling and re-installing WireShark, the extra bits it wanted to install (npcap etc) were all already newer than the ones the installer was offering but I am no further forward.

How (simply, please) do I get back to the point where WireShark can see the interfaces (LAN, Wifi etc)?


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answered 2022-07-28 11:31:52 +0000

grahamb gravatar image

WinPcap is obsolete and should not be used.

Usually a reinstall of the latest version of npcap is the best solution to such issues:

  1. Uninstall any copies of npcap and\or WinPcap.
  2. Reboot
  3. Install the latest version of npcap from their web-site.
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I made sure both WinPcap and npcap were uninstalled, restarted and then manually installed npcap (1.70) and restarted again. I am still getting the 'Local interfaces are unavailable because the packet capture driver isn't loaded' message when I start WireShark.( I can't upload an image, apparently I need 60 points, whatever that means).

Despite npcap being present in both the Program Files and Windows\System32\Drivers folders, I seem to be unable to get any recognition that npcap is running. If I type 'net start npcap' I get a 'The service name is invalid' response.

I don't know if I should install npcap in a 'WinPcap API-compatible mode' but I have tried it with and without.

I have no idea what to do next.

Magicbean gravatar imageMagicbean ( 2022-07-28 13:22:35 +0000 )edit

This would seem to be an npcap support issue, so their GitHub issues page is your next port of call.

grahamb gravatar imagegrahamb ( 2022-07-28 13:38:05 +0000 )edit

Ok, thanks, I am trying on the npcap github page.

Magicbean gravatar imageMagicbean ( 2022-07-28 13:59:53 +0000 )edit

Well, I got no response whatsoever on the npcap page. I have 3 PCs, Wireshark runs on all of them but npcap only runs on two of them (both Windows 10). I cannot get npcap to install on Windows 11 PC (doesn't come up with an error, but it doesn't create a service either). I have drawn a blank.

Magicbean gravatar imageMagicbean ( 2022-08-30 11:39:47 +0000 )edit

What was the npcap issue number you raised?

grahamb gravatar imagegrahamb ( 2022-08-30 13:44:07 +0000 )edit

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Asked: 2022-07-28 10:04:08 +0000

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Last updated: Aug 30 '22