In the Admin's settings in the webinterface (click My Account and My Settings) you can select two sensors. If either one of the two sensors is not UP (PAUSED, WARNING or DOWN) all monitoring if the IPCheck installation will be paused completely.
IPCheck Server Monitor makes it easy and affordable to detect network and website failures early. IPCheck Server Monitor helps organizations monitor critical network resources and immediately detect system failures or performance problems to minimize downtimes and avoid economic impact.