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Unable to connect to network when Npcap Packet Driver is enabled

asked 2020-04-28 17:01:10 +0000

Matt M gravatar image

I just installed Wireshark 3.2.3 which installed the latest Npcap packet driver. If the Npcap Packet Driver is enabled under my NIC card configuration, the workstation will not connect to the network. If I uncheck the Npcap Packet Driver, diable/enable to NIC card, I'm able to connect to the network just fine.

Does anyone have an idea what might be causing this? I updated my NIC driver (Intel 82579LM) to the latest release (3/29/2016) but the issue persists. I'm running on a Windows 7 box. Any assistance would be greatly appreciated.

Matt from Lakeland

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I'm having this exact same issue on 2 different wired nics. If it helps, you can disable npcap on the interface (i.e. uncheck it, close the options page), do a ping to a device on the net that is affected, and then reopen the interface options page, recheck npcap and it seems to get around the issue until the bug can be fixed.

PhilK gravatar imagePhilK ( 2020-04-29 14:36:01 +0000 )edit

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answered 2020-04-28 17:34:43 +0000

Guy Harris gravatar image

updated 2020-05-20 20:29:43 +0000

This is probably an Npcap issue; please report it on the Npcap issue list on GitHub, or, if another issue looks like yours, add a comment to that issue.

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answered 2020-04-29 02:46:18 +0000

LurkingKiwi gravatar image

updated 2020-04-29 02:52:36 +0000

npcap has a bug report from 18 days ago, saying they removed some supposedly optional and unused callbacks at v0.9987, persisting through v0.9990. A fix is supposed to come in V0.9991. https://github.com/nmap/nmap/issues/1998 and possibly several other ones. I just had this issue myself winth Win7 SP1 X64.

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Asked: 2020-04-28 17:01:10 +0000

Seen: 95 times

Last updated: May 20