In this case, this looks like ADC is not able to calculate client/server RTT. I agree this seems to be confusing that if actual client/server RTT is present or ADC is not able to calculate. We need to provide some way to inform user whether RTT was not calculated or RTT is actually 0. Under WebInsight, we do represent as NA (if RTT is not able to calculate), otherwise <1 ms (if RTT is actually < 1 ms). We may have bring similar in detail transaction reporting as well.