I am trying to connect and reply file minifilter driver. For connection I am using this hr = FilterConnectCommunicationPort(MyPortName,0,NULL, 0,NULL, &port); completion = CreateIoCompletionPort(port,NULL,0,1); FilterGetMessage to recieve message I am using this: hr = FilterReplyMessage(context.Port(PFILTER_REPLY_HEADER)&replyMessage.ReplyHeader,My_REPLY_MESSAGE_SIZE); These functions are working fine but some time FilterReplyMessage is taking time and giving error [...] read more