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Procedure entry point PacketGetMonitorMode could not be located in the DLL

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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

Marty ATS's avatar
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Marty ATS
asked 2019-07-20 15:06:56 +0000
Guy Harris's avatar
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Guy Harris
updated 2020-03-09 06:58:33 +0000
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Can you provide complete Wireshark Help -> About Wireshark information?

cmaynard's avatar cmaynard (2019-07-20 15:43:40 +0000) edit
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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.
grahamb's avatar
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grahamb
answered 2019-07-20 15:45:11 +0000
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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's avatar Guy Harris (2020-03-09 06:58:17 +0000) edit
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