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Npcap 1.40 Setup Failed to create the npcap service #513

4-FLOSS-Free-Libre-Open-Source-Software opened this issue Jun 21, 2021 · 5 comments
bug current installation


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@4-FLOSS-Free-Libre-Open-Source-Software 4-FLOSS-Free-Libre-Open-Source-Software commented Jun 21, 2021

Npcap 1.40 Setup

Failed to create the npcap service: 0x00000000. Please try installing Npcap again, or use the latest official Npcap installer from


Npcap 1.40 Setup
Npcap 1.40 Setup

windows 21h1 19043.1052 x64

npcap-1.40.exe /prior_driver=yes fails to. Reinstalling npcap-1.31.exe works. after npcap-1.40.exe /prior_driver=yes deleted my npcap-1.31 driver. While npcap-1.31 works without any issues, npcap-1.40 doesn't install.

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@SilmorSenedlen SilmorSenedlen commented Jun 21, 2021

Good day,
I have the same result on 3 hosts:

  1. Windows 10 Enterprise LTSC / Version 1809 (OS build 17763.1935) x64 (AMD)
  2. Windows 10 Enterprise LTSC / Version 1809 (OS build 17763.1999) x64 (Intel)
  3. Windows Server 2019 / Version 1809 (OS build 17763.1879) x64 (VM) (Host system: VMware ESXi, 6.5.0 U3, 17477841) / VMware Tools
    Logs from all 3 hosts:
    Error when npcap service installing:
    And also stucked on aborting:

On all hosts used local system admin account. But on VM, also new user with Administrators group rights was created, but with the same installation error result.

Npcap 1.31 work fine on all this hosts.

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@gjf gjf commented Jun 22, 2021

Hi there.

Same Problem, same error on Windows 10 x64 21H1:

Npcap 1.31 installs OK. Have to revert back.

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@fyodor fyodor commented Jun 22, 2021

Thanks everyone! I'm able to reproduce this on one of my Windows 10 virtual machines too. We're investigating the situation now.

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@driver1998 driver1998 commented Jun 22, 2021

For the new comers that are affected by this issue, Npcap 1.31 is at

@dmiller-nmap dmiller-nmap added current installation bug labels Jun 22, 2021
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@dmiller-nmap dmiller-nmap commented Jun 23, 2021

Npcap 1.50 resolves this issue.

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