Checking of URL availability

Checking of URL availability

Is there a document on how does OPManager check the availability of a URL? Cause in some cases, even if the URL is up... it still shows that the URL is down and when I try to test via "TEST URL" it times out; but if I manually inputted the url on the explorer it works fine.
Also 1 more thing, is there a way to create a rule if the threshold is violated n times before it sends out an alarm to avoid false positive?

Thanks


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