There are a couple of things that can cause TCP connection errors when reimaging the cRIO. One is the Windows firewall. Another is using the Classmate with a direct cable and no intermediate router or switch device.
I found another possibility on the NI web site:
Quote:
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Originally Posted by http://digital.ni.com/public.nsf/allkb/922DDC440FCB15048625719D006FCB97?OpenDocument
If the controller is connected to the development PC with a cross-over cable, this error is typically caused by specifying a gateway IP address for the controller when one does not exist.
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Check your network configuration and make sure there's no gateway set.