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debuggingwindbgremote-debugging

WinDbg, host machine lose network if test machine is on the same switch

I have a really strange problem with WinDbg and would like to know if anyone can explain to me why it happens.

So here is the setup:

  • Debugging a target Windows 7 64bit machine with WinDbg
  • Host machine running Windows 7 64bit also
  • Host and Test machines connected via firewire
  • Host and Test machines connected to the same switch (a Netgear gigabit switch, 8 port)
  • Break into the test machine

Problem: After about 10 seconds the host machine loses network connection

What resolves the problem immediately:

  • Run on test machine (Go)
  • Unplugging the test machine's Ethernet cable

Does anyone know why this happens, and if there are solutions?

Solution

  • Try disabling Flow Control on the network adapter of your target machine (generally there is an option in the Device Manager settings for the device). If you don't have a specific flow control option (or even if you do), also set the network adapter to Half Duplex mode.