SSL monitoring vs uptime monitoring: what's the difference?
Uptime monitoring and SSL/infrastructure monitoring sound similar but answer opposite questions. One tells you something is already broken; the other warns you before it breaks. Knowing the difference is the difference between a fire drill and a calm five-minute fix.
Uptime monitoring: reactive by design
An uptime monitor pings your site every minute and alerts you when it stops responding. It is essential — but it is fundamentally reactive: by the time it fires, the site is already down and customers are already seeing it. You find out at the same moment they do.
It also cannot see the causes that build up over days. An uptime check passes right up until the certificate expires or the domain lapses — and then it fails, with no warning that would have let you prevent it.
SSL & infrastructure monitoring: pre-emptive
SSL, domain, DNS and email monitoring watches the things that take a site down before they do. A certificate has an expiry date; a domain has a renewal date; DNS and email records have a correct state. Each of those is knowable in advance, so a good monitor warns you days early — while the fix is trivial.
This is the opposite posture to uptime: instead of "it's down, go", it is "this will go down in 14 days unless you renew". That lead time is the entire value.
Why you want both
They cover different failure classes. Uptime catches sudden outages — a crashed server, a bad deploy, a DDoS. Pre-emptive monitoring catches the slow, silent expiries and drifts that uptime is blind to until the last second. Running only uptime means every certificate and domain expiry is a surprise; running only pre-emptive monitoring means a server crash goes unnoticed.
What VigilDog does
VigilDog is the pre-emptive half: it watches domain expiry, SSL/TLS certificates, DNS and drift, and email deliverability across every domain you manage, and warns you days before anything breaks — tuned to never cry wolf. Pair it with an uptime monitor and you have both the sudden and the silent failures covered. Start free on your first domain.