# SSL certificate monitoring before expiration becomes downtime.

> Monitor SSL certificate expiration, TLS validity, issuer changes, HTTPS trust, and uptime. Get early alerts before certificates expire.

Canonical: https://sentryxmonitor.com/services/ssl-certificate-monitoring/
Last updated: 2026-07-30

SSL monitoring

Track certificate expiration, issuer changes, hostname validity, TLS handshakes, and HTTPS availability from outside your network. Your team gets evidence before customers see a browser warning.

[Check a certificate free](https://sentryxmonitor.com/services/ssl-certificate-monitoring/#scan) [Explore attack surface monitoring](https://sentryxmonitor.com/services/external-attack-surface-monitoring/)

Certificate evidence HTTPS

**Issuer**Google Trust Services

known

**Expires**18 days remaining

watch

**Valid chain**hostname matches certificate

pass

**TLS handshake**completed in 121 ms

pass

Why certificate monitoring matters

## An SSL failure can make a healthy application unreachable.

When HTTPS trust fails, browsers display warnings, API clients can reject connections, and payment flows can stop before your application receives a request.

### Expiration alerts

Receive warnings before renewal becomes an incident, with enough time to reach the right certificate owner.

### Issuer and TLS context

Review issuer, expiration, hostname validity, trust chain, and TLS evidence in one place.

### Connected uptime evidence

When a check fails, see whether the problem is in DNS, TCP, TLS, or HTTP.

From certificates to availability

## Certificate health belongs beside uptime monitoring.

A certificate is more than a compliance item. It determines whether users can reach a service and whether API clients trust the endpoint.

**01****Discover HTTPS hosts**

Identify public assets whose certificates need monitoring.

**02****Record certificate details**

Track issuer, expiration, validity, hostname match, and TLS behavior.

**03****Alert before expiration**

Notify the team before a certificate becomes an outage risk.

**04****Explain TLS failures**

Show when an uptime failure is a certificate problem rather than an application problem.

Free SSL check

## Check your domain from the outside.

Start with certificate evidence, then choose which hosts need monitoring.

## Related
- [Home](https://sentryxmonitor.com/)