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Procedure entry point PacketGetMonitorMode could not be located in the DLL

asked 2019-07-20 15:06:56 +0000

Marty ATS gravatar image

updated 2020-03-09 06:58:33 +0000

Guy Harris gravatar image

When I launch Wireshark by opening a pcap file, I get this error: Procedure entry point PacketGetMonitorMode could not be located in the DLL C:\Windows|System32|Npcap\wpcap.dll

The wpcap.dll file is indeed present and where is should be.

However, Wireshark does proceed to open with the file anyway.

??? Thanks

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Can you provide complete Wireshark Help -> About Wireshark information?

cmaynard gravatar imagecmaynard ( 2019-07-20 15:43:40 +0000 )edit

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answered 2019-07-20 15:45:11 +0000

grahamb gravatar image

Not entirely certain what's gone wrong there, but I would suggest the following as a recovery:

  1. Close all running Wireshark instances, and anything else that might be using npcap (e.g. nmap), even better to reboot.
  2. Uninstall any installations of npcap and WinPcap you find in the list of installed applications.
  3. Reboot.
  4. Ensure there are no installations of npcap or WinPcap left in the list of installed applications, if any found, repeat from step 2.
  5. Install the latest npcap from their website, currently 0.996.
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This appears to be caused by both Npcap and WinPcap having their "packet.dll" library installed.

Finding all installations of WinPcap shouold be sufficient, although uninstalling older versions of Npcap and installing the latest version is still a good idea. If that doesn't work, see if there are any files named "wpcap.dll" or "packet.dll" in C:\Windows\System32 and, if there are, remove all of them.

Guy Harris gravatar imageGuy Harris ( 2020-03-09 06:58:17 +0000 )edit

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Asked: 2019-07-20 15:06:56 +0000

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Last updated: Mar 09 '20