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What causes a "11687 TCP/IP machine in a bad state" error when using the Concept simulator?

                                               
11687    TCP/IP machine in a bad state

1/  This error can occur if there are XXMIT or XMIT blocks in the project. Delete the blocks and redownload if using the simulator.
2/  Another device with the same IP address?
3/  Corrupt Winsock.exe or Ethernet NIC driver?

 
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