This may indicate a problem with the physical network (cables, fault NICs or hubs).
Heavy network traffic may also lead to network applications generating this error (if that's the case, Microsoft recommends to retry the operation at a later time when the network is less congested).
This error may also occur when trying to access a network shared mapped to a local drive but the account used to map the drive is no longer valid (i.e. has logon time restrictions).
Certain applications (i.e. proxy servers) may generate this error code when there are conflicts with other applications that use the same TCP/IP port.
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