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You are here: Home / Programs / WireShark / The NPF driver isn't running – Wireshark

Mar 31, 2009 By Jared Heinrichs 43 Comments

The NPF driver isn't running – Wireshark

Wireshark – The NPF driver isn’t running

As soon as I opened my wireshark, the message popped up: “The NPF driver isn’t running…

As a local administrator do this:

net start npf

Now go back and open WireShark. Everything will be ok πŸ˜‰

Filed Under: WireShark

Comments

  1. Scott says

    Jan 19, 2010 at 12:06 pm

    Your post has been found. I thank you for this information, as it worked quite well.
    ~Scott

  2. Filipe says

    Mar 3, 2010 at 12:43 pm

    Is there anyway to run this at startup?

  3. Joao says

    Apr 20, 2010 at 10:30 am

    Thanks!

  4. Tim says

    Apr 27, 2010 at 4:08 pm

    I’ve tried doing this, but when I do it gives me this message “System error 5 has occured. Access is denied”
    I am using Win7 Pro in administrator mode, and I even used the run program with control+alt+enter to make sure I was in admin command prompt. What else can I do?

  5. Sarah says

    May 4, 2010 at 9:02 pm

    Tim, make sure you are running Wireshark itself as administrator.

  6. tom says

    May 5, 2010 at 9:00 am

    click on the shortcut, select properties, select run as administator. when she starts npf will start also.

  7. Nik says

    May 10, 2010 at 4:46 pm

    Run command prompt as admin not as user admin. you need to be in the C:/windos/system32/ directory to run the ‘net start npf’ command as admin

  8. Lazfroc says

    May 11, 2010 at 2:57 am

    @Tim

    You can start the driver by hand before starting Wireshark and stop it afterwards.
    Using Wireshark running in a user account could look like:
    Start the NPF driver:
    runas /u:administrator “net start npf”
    Start Wireshark as a user and work with it, including capturing, until the specific job is finished.
    Stop the NPF driver again:
    runas /u:administrator “net stop npf”

  9. AntΓ³nio Santos says

    May 17, 2010 at 12:35 pm

    Thank you!

  10. Diana says

    Jun 5, 2010 at 8:44 am

    Running it as an admin worked for me.

    Thanks.

  11. Chris says

    Jun 10, 2010 at 1:02 am

    Ran the program in administrative mode. Worked fine. Loaded all drivers and everything.

  12. Herjan says

    Jun 29, 2010 at 1:03 am

    Thanks for the solution!

    Simple but effective πŸ˜‰

  13. J-Rock says

    Aug 21, 2010 at 7:11 pm

    Thanks!!

  14. Aashish says

    Sep 30, 2010 at 12:13 pm

    Hi,

    I am new at using Wireshark. I need to trace packets from a darwin streaming server using VLC at the client. TCP connection establishment, RTP data packets and RTCP packets and things like that. I have setup the darwin server and also the Wireshark. Any suggestions on how should I proceed.

  15. Jared Heinrichs says

    Sep 30, 2010 at 6:12 pm

    For beginners I would try and look at this article: http://portforward.com/networking/wireshark.htm

  16. Tshego says

    Oct 12, 2010 at 2:28 am

    Running as Administratoe worked for me….
    Thank you very much

  17. nacron says

    Nov 6, 2010 at 1:09 am

    Thanks so much!! Effective and fast solution!!!

  18. ahsan says

    Nov 9, 2010 at 2:49 pm

    thanks tom. its working the way you said.

  19. dMan says

    Nov 19, 2010 at 9:32 pm

    thanks tom and sarah

  20. vRussell says

    Dec 29, 2010 at 10:57 am

    Thanks a lot! That’s exactly what I am looking for!

  21. wahyu says

    Jan 20, 2011 at 3:40 am

    Thanks a lot. it is really works like magic πŸ˜€

  22. Gui says

    Feb 23, 2011 at 5:35 pm

    Install Winpcap

  23. SSK says

    Apr 1, 2011 at 10:01 am

    Thanks man, it worked great

  24. thokchom sanjeet says

    Apr 10, 2011 at 8:34 pm

    it worked after running as admin thanks!

  25. Araneda says

    Apr 18, 2011 at 2:30 pm

    it works. Thanks

  26. Eteng Socrates says

    Apr 20, 2011 at 3:35 am

    Thanks alot. It worked for me too.

  27. Anny says

    May 13, 2011 at 6:14 am

    The thing is that you must run it as administrator

  28. Ibrahim Aziz says

    May 23, 2011 at 12:08 pm

    Yes, this worked great.

  29. Raj says

    Jun 13, 2011 at 8:19 pm

    i i am using windows 7 ultimate

    i cant understand “net start npf”

    i run this but it showing me search result

    please help me.

  30. Jared Heinrichs says

    Jun 14, 2011 at 6:52 am

    “net start npf” is needed to be run from a command prompt. Right click a shortcut to the command prompt and tell it to run as an administrator. A little black command prompt window will open. type those three words exactly how you see them including the spaces. It will work.

  31. Walt says

    Jun 15, 2011 at 5:50 am

    Where ever you all may be .. Thanks dudes! net stat npf worked for me

  32. Jared Heinrichs says

    Jun 15, 2011 at 7:46 am

    You’re welcome. You should check out the rest of my site and maybe add my RSS feed to your reading πŸ™‚ Have a good one.

  33. Rajesh says

    Jul 1, 2011 at 11:52 am

    By running as an administrator i am able to find the interfaces but the packet sniffing does not show up, kindly share your thoughts.

  34. SomeOne says

    Sep 11, 2011 at 5:45 am

    Thanks, it worked πŸ™‚

  35. Orlando Canino says

    Sep 26, 2011 at 2:28 am

    Works OK. Win 7, installed Wireshark, worked fine the first time the program is runned. Turn off the PC, turn on, start Wireshark and since then message “NPF driver not found” is shown.

    Tried : “net start npf” from command prompt, but doesnt work, says “Access denied”.

    Right click on shortcut, properties, enable “run as admin”, ok. Then click on shortcut and goes OK.

  36. Thanks says

    Oct 2, 2011 at 9:45 pm

    Thanks a lot

  37. Fiona says

    Oct 18, 2011 at 1:07 am

    I just reinstalled my pc, then the WireShark didn’t work for me …even after doing what you suggested…cmd said server invalid

  38. Simon J says

    Nov 11, 2011 at 2:58 pm

    The way that worked for me was:
    Right Click on Short Cut, Properties, Compatability Tab, where it says Privilege Level, tick “run this program as an administrator”.

  39. Bhabani says

    Dec 31, 2011 at 1:47 pm

    ThanX guys…. U guys are such a help… I have been looking for this soln for quite sometime

  40. William says

    Feb 25, 2012 at 5:38 am

    worked 100%.

  41. Anders says

    Mar 20, 2012 at 2:49 am

    Was to lazy to think for myself, googled and found this sollution which worked out nicely. Thanks!

  42. azziporah says

    Mar 29, 2012 at 8:42 am

    `net start npf` works for me, thanks!

    Still wondering, what is npf anyway?
    It’s nowhere in services.msc, nor `wmic service list`.

  43. Reda says

    Aug 19, 2013 at 6:24 am

    thanks it worked for me

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