Winpcap Error Npf Driver

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Winpcap Error Npf Driver Average ratng: 4,5/5 2713 votes
Active4 years, 8 months ago
  • Npf.sys is a filter driver that is essential for the functioning of WinPCap. This is a driver file that may be required for the correct functioning of one or several applications and should not be removed.
  • Then if herebooted anddid a 'sc queryex npf', it said npf was stopped, however, npf running on one Win 7 64 system. And, to add, it seems like I did have it problem: Include 'pcap-int.h' instead of 'pcap.h'.

WinPcap 4.1.3 official installer hangs at 'extract: Packet.dll' or similar. Wireshark gives this message on startup 'The NPF driver isn't running. You may have trouble capturing or listing interfaces.' NetScanTools Pro gives a message that WinPcap is not found or if it is found NetScanTools Pro locks up when you run a tool that uses WinPcap.

When I start up Wireshark, why do I see this message?

'The NPF driver isn't running. You may have trouble capturing or listing interfaces.'

Matthew SimoneauMatthew Simoneau
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4 Answers

You need to run Wireshark with administrator privileges.

  1. Exit Wireshark.
  2. Find Wireshark on the Start Menu.
  3. Right-click on it.
  4. Select 'Run as administrator',
  5. Click 'Yes' in the user account control dialog.
Matthew SimoneauMatthew Simoneau
5191 gold badge6 silver badges17 bronze badges

It's really best not to run Wireshark as Administrator. See here for an explanation - bugs in the dissector can do a lot more damage when it runs as administrator. A better solution (offered here) is the following:

  • Open a command prompt (cmd.exe) using the 'Run as administrator' option
  • Run the command sc qc npf
    You will see output similar to this:
  • If it looks like this, you will need to start the service using sc start npf
    so that it displays STATE : 4 RUNNING.

  • To start the service automatically in future, use sc config npf start= auto
    (that space after the equals sign is important)

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user111412user111412

Run 'cmd.exe' as Administrator, and go

then

To make sure type 'sc qc npf', you will get the output:

To make it back type:

Darius MiliauskasDarius Miliauskas

RTI Protocol Analyzer with Wireshark uses the Windows Packet capture (WinPcap) driver called NPF driver when it starts to capture live data. Loading the driver requires Administrator privileges.

To cllear this error, you need to open the file called npf.sys which is located at

in Windows 7. Follow the below guide to open the npf.sys file.

Firstly, make sure that you have installed winpcap, if you didn't install it, just go to its official site and download it for installation: http://www.winpcap.orgNext, find cmd.exe which is located at

in Windows 7, right click and 'Run as administrator'. When it opened, input net start npf, then the NPF driver is successfully opened. That is,the file npf.sys is opened. At last, restart Wireshark, it will be OK now.

Note:
If you are using Linux or Ubuntu, after WinpCap is installed, use the common ' >$ su Administrator ' to switch to the highest authority account, then input net start npf .

If you are using Windows XP, login with administrator account then open cmd, input net start npf.

Jan Doggen
3,2296 gold badges28 silver badges45 bronze badges
user401628

Not the answer you're looking for? Browse other questions tagged wireshark or ask your own question.

Active4 years, 8 months ago

When I start up Wireshark, why do I see this message?

'The NPF driver isn't running. You may have trouble capturing or listing interfaces.'

Matthew SimoneauMatthew Simoneau
5191 gold badge6 silver badges17 bronze badges

4 Answers

You need to run Wireshark with administrator privileges.

  1. Exit Wireshark.
  2. Find Wireshark on the Start Menu.
  3. Right-click on it.
  4. Select 'Run as administrator',
  5. Click 'Yes' in the user account control dialog.
Matthew SimoneauMatthew Simoneau
5191 gold badge6 silver badges17 bronze badges

It's really best not to run Wireshark as Administrator. See here for an explanation - bugs in the dissector can do a lot more damage when it runs as administrator. A better solution (offered here) is the following:

Winpcap Error Npf Driver Download

  • Open a command prompt (cmd.exe) using the 'Run as administrator' option
  • Run the command sc qc npf
    You will see output similar to this:
  • If it looks like this, you will need to start the service using sc start npf
    so that it displays STATE : 4 RUNNING.

  • To start the service automatically in future, use sc config npf start= auto
    (that space after the equals sign is important)

user111412user111412

Run 'cmd.exe' as Administrator, and go

then

To avoid losing anything you'll need to save copies of all the files, photos, and other information you want to keep on to an external hard drive. Windows vista 64 bit upgrade. Windows Easy Transfer is a free tool you can use to copy your information (but not programs) from your PC and then put them back after you install Windows 7. If you don't have an external hard drive you won't be able to use Windows Easy Transfer, instead you can copy files youwant to keep on a USB flash drive, or on CD/DVD.3.

To make sure type 'sc qc npf', you will get the output:

Winpcap 4.1.3 Error Npf Driver

To make it back type:

Darius MiliauskasDarius Miliauskas

RTI Protocol Analyzer with Wireshark uses the Windows Packet capture (WinPcap) driver called NPF driver when it starts to capture live data. Loading the driver requires Administrator privileges.

To cllear this error, you need to open the file called npf.sys which is located at

in Windows 7. Follow the below guide to open the npf.sys file.

Firstly, make sure that you have installed winpcap, if you didn't install it, just go to its official site and download it for installation: http://www.winpcap.orgNext, find cmd.exe which is located at

in Windows 7, right click and 'Run as administrator'. When it opened, input net start npf, then the NPF driver is successfully opened. That is,the file npf.sys is opened. At last, restart Wireshark, it will be OK now.

Note:
If you are using Linux or Ubuntu, after WinpCap is installed, use the common ' >$ su Administrator ' to switch to the highest authority account, then input net start npf .

If you are using Windows XP, login with administrator account then open cmd, input net start npf.

Jan Doggen
3,2296 gold badges28 silver badges45 bronze badges
user401628

Not the answer you're looking for? Browse other questions tagged wireshark or ask your own question.