A BSOD is displayed and Netguard.sys is marked as the cause

Version 1

    Problem

    A BSOD is displayed and Netguard.sys is marked as the cause in the crash dump.
    The server may also crash with a BSOD approximately every 12 hours.

    Cause

    HP NC7781 NIC does not have the latest drivers installed; BSOD cause: Netguard.sys
     
    The NC7781 NIC does not close connections when Netguard is used. When 100.000 connections are reached, Netguard will cause a BSOD and generate a memory dump. If Netguard does not crash, the server simply hangs, without a probable cause.      


    Solution

    Retrieve and install the latest drivers for the HP7781 NIC to resolve the problem.