Active Monitoring

Active monitoring checks a website or service by simulating real visitor requests from an external checking service, on a regular schedule, rather than waiting for actual users to encounter and report a problem. Checking servers send requests the same way a real browser or client would, and if a request fails or times out, the failure is caught and reported immediately — independent of whether any real visitor happened to hit the broken page at that moment.

How active monitoring works

An active monitoring system runs checks from many locations, distributed around the world, at a fixed interval. Because the checks are independent of your own infrastructure and your web hosting provider, they give a genuinely third-party view of whether a site is actually working — a status your own server logs or hosting dashboard can't fully provide, since both can be affected by the same underlying problem the check is trying to catch. For large or content-heavy pages, monitoring systems typically download only enough of the page to confirm it loaded correctly, rather than the full page every time, to keep the checking traffic light while still catching real failures.

Active vs. passive monitoring

Active monitoring is the counterpart to passive monitoring, which observes real user traffic as it happens rather than generating synthetic requests. Active monitoring's advantage is that it works even when a site has little or no real traffic to observe, and it can check from locations and at times you choose rather than depending on where your actual visitors happen to be.

What active monitoring catches

Because active checks run continuously regardless of real traffic, they catch outages during low-traffic periods — nights, weekends, between customer visits — that could otherwise go unnoticed for hours. Checking from multiple distributed locations also distinguishes a real outage from a single network's local routing problem, avoiding false alarms while still catching genuine failures anywhere a check runs from.

How HostTracker uses active monitoring

HostTracker's active monitoring runs from 300+ locations worldwide, using any of 14 check types — HTTP/S, ping, TCP port, transaction, and more — on a schedule you control. Run a free check with the HTTP check tool, or set up continuous distributed monitoring to have active checks running around the clock. See why websites need monitoring for the case for continuous checking over waiting for user reports.