2012SrvWhile transmitting or receiving data, the server encountered a network error. Occassional errors are expected, but large amounts of these indicate a possible error in your network configuration. The error status code is contained within the returned data (formatted as Words) and may point you towards the problem.
As the event content itself implies, this warning can usually be safely ignored.
We often get these warnings as a result from laptops accessing file servers through VPN.