I am trying to get the loopback interface working on wireshark
I read here https://wiki.wireshark.org/CaptureSetup/Loopback that I should install Npcap https://svn.nmap.org/nmap-exp/yang/NPcap-LWF/npcap-nmap-0.05.exe
I tried but I got these errors
"failed to create npcap service for win7, win8 and win10. Please try installing Npcap again, or use the official Npcap installer from www.nmap.org"
"Failed to create the npf service for win7, win8 and win10"
"Windows requires a digitally signed driver A recently installed program tried to install an unsigned driver. This version of Windows requires all drivers to have a valid digital signature. The driver is unavailable and the program that uses the driver might not work correctly....npcap.sys"
I looked here https://github.com/nmap/npcap/tree/master/installer
but I don't see any EXEs and one of the files says something about rolling back to 0.05 which (looking at the URL I downloaded the EXE from) is the version of EXE I have
asked 16 Sep '15, 16:46
edited 17 Sep '15, 01:02
Guy Harris ♦♦
I presume you are using a Windows 7 x64 PC, right? Npcap is signed with a SHA2 certificate so you must ensure that your Windows 7 has this security update installed: https://technet.microsoft.com/en-us/library/security/3033929
Having an up-to-date Windows should solve the issue.
answered 17 Sep '15, 04:11
This is an issue with the Npcap driver; that's still somewhat new code and may still have some rough edges. You should report it either to the Nmap mailing list or to Yang Luo, the developer - see the end of the main Npcap page for their e-mail addresses.
answered 17 Sep '15, 01:04
Guy Harris ♦♦
Hi, I am the developer, sorry for being late!
https://github.com/nmap/npcap/ is the source code repo, so you probably won't find any EXE installers there:)
https://github.com/nmap/npcap/releases is where all the installers will be.
And I rechecked this issue and it turned out that Pascal is right, you need to install that update to enable the SHA2 in Windows 7, otherwise Npcap will be regarded as a non-signed software and forbidden to be installed on Windows.
You should install the lastest Npcap 0.05 R14, all signing issues should have gone.
answered 17 Oct '15, 18:23
edited 26 Feb '16, 19:09