If you manage more than a handful of client websites, you've probably felt this: you have no reliable way to know when an SSL certificate is about to expire until something breaks.
Spreadsheets go stale. Calendar reminders get ignored. And the client always notices the security warning before you do.
Here's how to actually monitor SSL certificates across many client sites without losing your weekend to it.
Why Manual Tracking Fails
The obvious approach is a spreadsheet — domain, expiry date, renewal date. It works for three sites. It falls apart at twenty.
The problem is that the data goes out of date the moment you write it down. A certificate renews early, a client migrates hosting, a new site gets added and nobody updates the sheet. Within a month your spreadsheet is fiction.
Worse, a spreadsheet doesn't alert you. You have to remember to check it. And the one week you forget is the week something expires.
What Good Monitoring Actually Requires
Effective SSL monitoring across many sites comes down to four things:
- ✓An automated daily check of every certificate
- ✓Day-count tracking so you know exactly how long until expiry
- ✓Alerts at multiple thresholds, not just one
- ✓No credentials stored anywhere
That last point matters more than people realize. If a monitoring tool asks for server access, registrar logins, or API keys, you've created a security liability across every client you manage. One breach exposes all of them.
The good news: you don't need any of that to monitor a certificate.
How Certificate Checking Works Without Credentials
An SSL certificate is public. When a browser connects to a site over HTTPS, the server presents its certificate during the TLS handshake — including the expiry date. Anyone can read it. No login required.
That means a monitoring tool only needs the domain name. It connects the same way a browser does, reads the expiry date from the certificate, and calculates the days remaining. Nothing private is touched.
This is the entire technical basis for credential-free monitoring. You add a hostname, the tool checks it daily, and you get alerted before it expires.
Setting Up Monitoring Across Client Sites
The practical workflow looks like this:
- ✓Make a list of every client domain you're responsible for
- ✓Add each one to a monitoring tool by hostname
- ✓Set alert thresholds — 30, 14, 7, and 1 day before expiry is a solid default
- ✓Route alerts somewhere you'll actually see them — email and Slack both work
The thresholds matter. A single 7-day warning is easy to miss if you're on vacation. Alerts at 30 and 14 days give you breathing room to schedule the renewal properly instead of scrambling.
Don't Forget Domain Expiry
SSL certificates get most of the attention, but domain registration expiry is the more catastrophic failure. A lapsed certificate shows a warning. A lapsed domain can be bought by someone else.
Any monitoring setup for client sites should track both the certificate expiry and the domain registration expiry. They fail for completely different reasons — a cert fails on renewal automation, a domain fails on a billing problem at the registrar — so monitoring one doesn't protect you from the other.
The Simplest Path
If you want this handled without building it yourself, that's exactly what I built ExpiryPing to do. You add your client domains by hostname, and it checks SSL and domain expiry daily, sending email and Slack alerts at 30, 14, 7, and 1 day before anything expires. No credentials, no agents, no server access.
It's free for up to 3 domains, and paid plans start at $19/month for agencies managing more.
However you choose to do it, the principle is the same: automate the checking, alert at multiple thresholds, and never store a credential you don't need.