Connection Failures is the number of times TCP connections have made a direct transition to the CLOSED state from the SYN-SENT ...

Connection Failures is the number of times TCP connections have made a direct transition to the CLOSED state from the SYN-SENT state or the SYN-RCVD state, plus the number of times TCP connections have made a direct transition to the LISTEN state from the SYN-RCVD state.