Negative Number displayed for Server Response Time

Negative Number displayed for Server Response Time

I have installed version 7.0.

I have a server monitor setup to monitor a machine over the internet.
All I want to know is the Responce time and that the machine is present.
The issues is that at certain times the values returned for the last monitor are negative numbers. I know the machine is available and the connection is active as others are using the machine from our office.

What do the negative numbers mean?





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