SSL certificate monitoring
Never miss an expiry
Track SSL certificates across all your client sites. Get alerted weeks before they expire so you never face a browser security warning.
Status
valid
Issuer
Let's Encrypt
Valid from
Jan 10, 2026
Valid until
Apr 10, 2026
31 days
Status
valid
Issuer
Cloudflare, Inc.
Valid from
Feb 1, 2026
Valid until
Mar 18, 2026
8 days
Why SSL monitoring
Expired certificates destroy client trust
An expired SSL certificate triggers browser security warnings that scare visitors away, tanks your client's SEO rankings, and breaks any API integrations relying on HTTPS. For agencies managing dozens of sites, a single missed renewal can mean lost revenue and a difficult client conversation.
- Automatic scanning of all SSL certificates
- Configurable alert thresholds (7, 14, 30, 60, 90 days)
- Certificate chain and issuer tracking
Certificate check · clientsite.com
- Issuer
- Let's Encrypt
- Valid from
- Jan 10, 2026
- Valid until
- Apr 10, 2026
- Alert thresholds
- 7 · 14 · 30 · 60 · 90 days
- On expiry
- Open incident + alert
Features
Complete SSL visibility
Expiry alerts
Get notified 7, 14, 30, 60, or 90 days before a certificate expires. Customize thresholds per monitor.
Certificate details
See the full certificate chain, issuer, valid dates, and certificate type for every monitored domain.
Multi-domain coverage
Monitor SSL across all your client sites in one place. No per-certificate fees: it's included with every monitor.
Instant notifications
Email, SMS, Slack, and webhook alerts ensure the right person knows about expiring certificates immediately.
Incident tracking
When a certificate expires or changes unexpectedly, an incident is automatically created with full diagnostics.
Bundled with uptime
SSL monitoring runs alongside your uptime checks. No extra configuration: just enable it when creating a monitor.
Coverage
Every certificate, checked continuously
SSL monitoring runs alongside your uptime checks on every monitor, with no per-certificate fees. Set the alert window you want and Sentinel keeps watching the chain, the issuer and the expiry date for you.
30d
Default alert window
24/7
Continuous scanning
100%
Certificate coverage
0
Missed expirations
How far in advance does Sentinel warn me about SSL expiry?
Sentinel alerts you weeks before a certificate expires, giving you plenty of time to renew before visitors ever see a browser security warning.
How will I be notified about an expiring certificate?
Alerts can reach you by email, SMS, Slack, Discord, and webhooks. Route them to whichever channel your team watches most closely.
Can I monitor SSL certificates for all my client sites at once?
Yes. Sentinel is built for agencies and freelancers, so you can track SSL certificates across every client site from a single account.
Does SSL monitoring replace uptime monitoring?
No, they complement each other. SSL monitoring is one of several monitor types and sub-checks alongside HTTP uptime, DNS, domain expiration, keyword, JSON/API response assertions, ICMP ping, TCP port reachability and heartbeat/cron job monitoring.
What happens if a certificate expires unexpectedly?
Sentinel keeps checking your certificates continuously, so if one expires or changes you are alerted right away rather than finding out from a client.
Is there a free trial for SSL monitoring?
Yes. Paid plans come with a 14-day free trial, there is also a free plan, and you can cancel anytime.
Never let a client's SSL certificate expire
Start monitoring SSL certificates across all your client sites.
No card for the free plan · 14-day trial on paid plans · Cancel anytime