Home | Blog | Software | Reviews and Features | Forum | Help | Donate | About us
topbanner_forum
  *

avatar image

Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
  • December 10, 2016, 04:16:48 PM
  • Proudly celebrating 10 years online.
  • Donate now to become a lifetime supporting member of the site and get a non-expiring license key for all of our programs.
  • donate

Author Topic: WinPCap issues - no npf.sys file on my system  (Read 12321 times)

TheGregster

  • Supporting Member
  • Joined in 2006
  • **
  • default avatar
  • Posts: 4
    • View Profile
    • Donate to Member
WinPCap issues - no npf.sys file on my system
« on: November 29, 2010, 08:55:50 AM »
Hi Mouser!  Have an odd problem here.  URL Snooper seems to install fine, but when WinPCap tries to install, I'm told that it can't open "c:\windows\system32\drivers\npf.sys" for writing.  Didn't take look to figure out why - it doesn't exist on my system... anywhere, not just in the "c:\windows\system32\drivers folder."  I'm running Windows 7, 64 bit (which is likely the problem).  If I tell it to install anyway, URL Snooper doesn't see any network adapters. No surprise there.  Was wondering if you have any thoughts on this.  If so, thanks!  If not, I'd appreciate it if you could drop everything else you're doing, re-write URL Snooper from the ground up, and eliminate the need for WinPCap entirely.  Oh yeah, then drive it over to my house and install it for me to make sure it works...   Thanks!   ;D

Greg

worstje

  • Honorary Member
  • Joined in 2009
  • **
  • Posts: 571
  • The Gent with the White Hat
    • View Profile
    • Donate to Member
Re: WinPCap issues - no npf.sys file on my system
« Reply #1 on: November 29, 2010, 01:31:05 PM »
I haven't installed Winpcap in a while, nor used this one.. but I bet it is trying to _write_ said file and doesn't have the permissions, hence it not existing. Did you try running that install with administrative privileges?

TheGregster

  • Supporting Member
  • Joined in 2006
  • **
  • default avatar
  • Posts: 4
    • View Profile
    • Donate to Member
Re: WinPCap issues - no npf.sys file on my system
« Reply #2 on: November 29, 2010, 03:30:16 PM »
That's an excellent suggestion - will try it and post the results - thanks!

TheGregster

  • Supporting Member
  • Joined in 2006
  • **
  • default avatar
  • Posts: 4
    • View Profile
    • Donate to Member
Re: WinPCap issues - no npf.sys file on my system
« Reply #3 on: November 29, 2010, 04:34:01 PM »
Aw nuts, didn't work.  I appreciate the suggestion though.  I'm going to try to attach a screen cap of the error. Never done this before, so forgive me if I make a mess...

Greg

WinPcap error.png

worstje

  • Honorary Member
  • Joined in 2009
  • **
  • Posts: 571
  • The Gent with the White Hat
    • View Profile
    • Donate to Member
Re: WinPCap issues - no npf.sys file on my system
« Reply #4 on: November 29, 2010, 10:29:39 PM »
Try using Process Monitor (not Process Explorer) from Sysinternals. It's a bit of an unwieldy utility, but if you set up a filter for the installer (or maybe for the path in question, either ought to work) and then reproduce your issue, maybe you can see why it fails to open it as it ought to display the reason for the failure. I find it hard to believe it is a problem everyone running Windows 7 has as most packet-inspection utilities lean heavily on WinPcap.

Alternatively, try installing another program that comes with Winpcap? I seem to recall software bundling it with their apps to make them easier to use. An example of such a program would be Nmap. (It's kind of a hack, but probably easier than debugging the problem like I suggested just now since it wouldn't garantuee a fix...)

PhilB66

  • Supporting Member
  • Joined in 2007
  • **
  • Posts: 1,522
    • View Profile
    • Donate to Member
Re: WinPCap issues - no npf.sys file on my system
« Reply #5 on: November 29, 2010, 11:18:54 PM »
Download the latest version of WinPcap (Version 4.1.2, 02 jul 10). The one you are trying to install had a bug. See here
« Last Edit: November 29, 2010, 11:20:39 PM by PhilB66 »

TheGregster

  • Supporting Member
  • Joined in 2006
  • **
  • default avatar
  • Posts: 4
    • View Profile
    • Donate to Member
Re: WinPCap issues - no npf.sys file on my system
« Reply #6 on: December 01, 2010, 11:00:43 PM »
Wow guys, appreciate all the help here.  I'll try installing the new version first, and if that doesn't work, I'll try worstje's suggestion.  I'll post the results, and again, thank you for the help on this   :)

Greg