Problems post install with npcap killing network connection

asked 2020-04-22 00:15:14 +0000

thedriver
3 ●1 ●1 ●2

I just remotely installed Wireshark on a 2008R2 Windows server; the npcap install didn't work, so I installed that manually. But immediately after installation of npcap-0.9990 I lost my connection to the computer. Logging in directly to the computer, I could see the LAN connection showed the network was disconnected or unplugged. I tried a number of things to resolve it which didn't work, but as soon as I uninstalled npcap adapter, it started working (I literally watched the ping response in real time).

However, now I still can't ping or connect to this computer via a VPN connection. Connecting via VPN is fine, but ping doesn't go through, and therefore nothing else, like SMB etc. This was working perfectly before Wireshark / npcap install.

answered 2020-04-22 00:25:28 +0000

Guy Harris
19890 ●3 ●633 ●207

updated 2020-05-20 20:56:59 +0000

This is probably an issue with Npcap, as a result of it installing its own driver into the Windows networking stack (which is a requirement for packet capture).

It's been reported on the Npcap issues list and perhaps also on the Nmap issues list (Npcap only recently got its own issues list; the Nmap list was used before that, but new Npcap issues should be reported on the Npcap list, not on the Nmap list).

File your report there, unless you find a report that's close enough that it's probably the same issue - in which case you should probably still give your details, so the Npcap developers have as much information as possible to try to diagnose this.

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Thanks Guy. Added to the npcap issues thread here: https://github.com/nmap/npcap/issues/105

thedriver ( 2020-04-22 02:00:43 +0000 )edit

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