If Windows polls to see if a connection is valid and subsequently closes the connection before the LabVIEW TCP/IP VI times out, then error 66 will result. However, without determinism it is not possible to specify which communication error will occur first. In a Windows environment, either error 56 or error 66 are possible. When LabVIEW attempts to communicate after Windows closes the connection, error 66 is the result. In this case, Windows notices that no data is returned within a reasonable time, and it closes the TCP/IP connection. Error 66 occurs if the TCP/IP connection is closed by the peer.This error is caused by the LabVIEW code not receiving a network response in the defined time limit. Error 56 is generated when an operation exceeds the user-specified time limit.There are two typical error codes in cases where TCP/IP communication fails as a result of a timeout condition:
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