This error states that the operation tried over the active connection was not valid. What this means is that the response received was not the one expected or more precisely in the format expected, probably not complying with the rules of the protocol that is in use over the current active connection.
As per M318245, this behavior may occur if the Trend Micro OfficeScan Corporate Edition antivirus program is installed on the client computers in the domain.
See the links below for more details on this error.
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