SSL Certificate Monitoring That Warns You Days Before a Cert Expires
An expired certificate turns your site into a scary browser warning in front of every visitor. Uptimehub watches your certs and domains so you renew on your schedule, not in a panic.
Checked from regions with auto-retry. No single-location false alarms.
All systems operational. Steady pulse across every region.
api.example.com returned no response from all 6 regions. Auto-retry confirmed the outage, then we alerted your team.
api.example.com is back up. The incident is logged to your status page history automatically.
90-day uptime · branded · your domain
Live demo · drive it, no signup needed
In short
SSL certificate monitoring continuously inspects the TLS certificate on your domain to confirm it is valid, trusted, and not close to expiring. Uptimehub checks your certificate from 6 regions and warns you well ahead of the expiry date, with configurable reminders so a renewal never sneaks up on you. It also catches certificates that are already invalid, self-signed, mismatched to the hostname, or served by a misconfigured chain, and it tracks domain registration expiry so the domain itself does not lapse either. Alerts arrive through Slack, email, SMS, or webhook in the same seconds the problem is detected. Because the check is read-only from the outside, it sees exactly the certificate your visitors browsers see.
What you get
SSL monitoring for developers, SaaS teams and agencies
Advance expiry warnings
Get reminders days ahead of the expiry date so you renew calmly on your own schedule instead of during an outage.
Catches invalid certs
Flags self-signed, hostname-mismatched, untrusted, or broken-chain certificates that quietly break trust for visitors.
Domain expiry too
Watches your domain registration date and warns before it lapses, protecting you from losing the domain entirely.
Sees what browsers see
Read-only external checks from 6 regions verify the exact certificate real visitors receive, not a local guess.
How it works
From URL to alert in four steps
Add your domain
Enter the hostname you want watched and set how many days ahead you want to be warned.
We check from 6 regions
Uptimehub inspects the live certificate and domain registration on a regular schedule.
Get alerted early
Well before expiry, or the instant a cert is invalid, you get a clear alert to renew.
Show trust on your status page
Reflect healthy TLS on your branded status page so customers see a secure, current service.
On this page
Certificate lifetimes are collapsing, and manual renewal is running out
In April 2025 the CA/Browser Forum passed ballot SC-081v3, which cuts the maximum lifetime of a publicly trusted TLS certificate from 398 days to 47 days in three steps. The first step is already in force: since March 15, 2026 no publicly trusted certificate can be issued for more than 200 days. This changes the economics of certificate management more than any single feature ever will.
| Maximum validity | In force from | Renewals per year, one certificate | Renewals per year, 50 certificates |
|---|---|---|---|
| 398 days | Until March 15, 2026 | 0.92 | 46 |
| 200 days | March 15, 2026 (current) | 1.83 | 91 |
| 100 days | March 15, 2027 | 3.65 | 183 |
| 47 days | March 15, 2029 | 7.77 | 388 |
The last column is the one that matters operationally. A company running 50 certificates handled about one renewal a week under the old rules. At 47 day certificates that becomes 388 renewals a year, more than one every single day. If you renew 30 days before expiry, a 398 day certificate leaves a 368 day quiet period; a 47 day certificate leaves 17 days, which is shorter than many change freezes.
Automated renewal is the correct response, and it is also why monitoring matters more rather than less. Renewal automation and expiry monitoring are two separate controls: the first does the work, the second tells you when the first stopped working. ACME clients fail quietly when a DNS challenge breaks, a firewall rule blocks the HTTP challenge, or a cron job disappears during a server rebuild. Nothing announces that. The certificate simply expires on schedule.
If you want to read the live certificate on a specific host right now, our SSL certificate checker connects on port 443 and reports the expiry date, days remaining, issuer, covered hostnames and whether the chain is complete. The full schedule and what to do about it is covered in certificate lifetime changes.
FAQ
Questions buyers ask about SSL monitoring
You can read the expiry date manually with openssl s_client -connect yourdomain.com:443 or by clicking the padlock in a browser, but neither tells you anything on the day it matters. A monitor that checks the certificate daily and warns you at 30, 14, and 7 days out is what actually prevents the outage.
Browsers stop loading the site and show a full-page security warning that most visitors will not click through. APIs and integrations fail harder still, because most HTTP clients refuse the connection outright with no way for a user to override. It is a total outage that arrives on a date you already knew.
No. Auto-renewal fails quietly more often than people expect: a cron job stops running after a server rebuild, the HTTP-01 challenge breaks behind a new redirect rule, DNS validation records get cleaned up, or rate limits block reissue. Monitoring the live certificate verifies the renewal actually reached production.
Thirty days is the right first warning, because it leaves room for a validation problem that needs DNS or vendor involvement. Follow it with reminders at 14 and 7 days. Anything under a week assumes the fix is trivial, and with EV certificates or a locked change window it often is not.
Yes. Certificates on mail servers, database connections, and internal services on ports other than 443 expire on the same schedule and are forgotten far more often, because no visitor sees a browser warning first. Point the check at the host and port and it validates the chain the same way.
Last updated July 2026
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Start monitoring in two minutes
Add a URL or endpoint and Uptimehub checks it every minute from 6 global regions, alerts you in seconds, and updates your branded status page. Read-only checks that never touch your servers.