SSL Certificate Monitoring

SSL certificate monitoring is the automated tracking of the TLS/SSL certificates that secure your HTTPS sites, watching their expiry dates and validity so you are warned before a certificate lapses and breaks the connection. It is a planned MonitorUrs capability, designed to alert you well ahead of expiry through the channels you already use.

Last updated: June 2026

What is SSL certificate monitoring?

Every site served over HTTPS relies on a TLS/SSL certificate to encrypt traffic and prove its identity to visitors. That certificate is valid only for a fixed window — often 90 days or one year — and must be renewed before it expires. SSL certificate monitoring is the practice of automatically reading the certificate presented by a host, checking how many days remain until it expires, and confirming it is still valid and trusted. The goal is simple: warn the right people early, so a certificate never silently expires in production.

This is a capability we are planning for MonitorUrs. It is not yet generally available, but the sections below explain what it is designed to do, how it will fit the platform, and — importantly — what you can already do today to protect your HTTPS sites while certificate-aware checks are still on the roadmap.

Why expiring certificates cause outages

An expired SSL certificate is one of the most common — and most avoidable — causes of website downtime. The moment a certificate passes its expiry date, browsers and API clients refuse to complete the secure handshake and show a full-page security warning instead of your content. To the average visitor the site is simply broken and untrustworthy, even though the server itself is running perfectly. For an API, expiry can break every integration that depends on it at once.

What makes this so dangerous is that expiry creeps up quietly. Renewal reminders land in an inbox nobody watches, the person who set up the certificate has moved on, or an automated renewal job fails without anyone noticing. There is no gradual degradation — the site works right up until the deadline and then fails instantly. Continuous certificate monitoring is designed to remove that risk by counting down to expiry for you and raising the alarm with days or weeks to spare.

What MonitorUrs plans to offer

The planned SSL certificate monitoring capability is designed to fit naturally alongside the checks MonitorUrs already runs. When it is generally available, it is expected to:

• Read the live certificate presented by each HTTPS host and record its expiry date and issuer.
• Alert before expiry — the feature is designed to warn you a configurable number of days ahead of the expiry date, so renewal happens on your schedule, not at the last minute.
• Flag validity problems such as an expired, not-yet-valid, untrusted or hostname-mismatched certificate.
• Notify on every channel — expiry and validity alerts will reach you through the same notification system MonitorUrs uses today: Telegram, SMS and Email.

All of the language above describes planned behaviour. Exact thresholds, configuration options and availability dates may change as the capability is built, and it is not something you can enable today.

What you can do today

While certificate-aware checks are still on the roadmap, MonitorUrs already protects your HTTPS sites in a practical way. You can add any HTTPS URL as a probe, and MonitorUrs will send a GET request to it on a configurable interval, check the HTTP status code and validate the response content. Because an expired certificate causes the secure connection to fail, an HTTPS probe will already turn unhealthy and alert you when expiry takes the site down — you simply find out at failure time rather than days ahead.

To be precise about today's behaviour: MonitorUrs does not currently parse or track TLS/SSL certificate expiry dates. It treats your HTTPS URL as an HTTP endpoint, checking availability and content and sending alerts via Telegram, SMS and Email after a consecutive-failure threshold. Tracking the certificate's expiry date directly is the planned capability this page describes. You can get started right now with HTTP endpoint monitoring and uptime monitoring.

How it will fit the platform

SSL certificate monitoring is designed to slot into MonitorUrs without changing the way you already work. The plan is for a certificate check to live alongside the HTTP rules on an existing probe, so a single HTTPS site can be watched for availability, content and certificate expiry at the same time. Expiry warnings will flow into the same alert pipeline as every other event, fire after the rules you configure, and appear in your history and on the real-time status dashboard next to your uptime data.

In other words, the capability is intended to extend the platform you already use rather than become a separate tool to learn. The same probes, the same channels, the same dashboard — with certificate awareness added on top.

Use cases

• E-commerce stores — a lapsed certificate on a checkout domain blocks every purchase, so an early expiry warning is designed to protect revenue directly.
• SaaS and API providers — when a single certificate secures many customer integrations, advance notice gives you time to renew before anyone is affected.
• Agencies managing client sites — track expiry across dozens of domains from one place instead of juggling separate renewal calendars.
• Internal tools and portals — catch quiet expiries on certificates that few people remember to renew.

For all of these, you can begin protecting the same sites today with website monitoring and layer in certificate-expiry alerts when the planned capability ships.

Frequently asked questions

What is SSL certificate monitoring?

SSL certificate monitoring is the automated tracking of the TLS/SSL certificates that secure your HTTPS sites, watching their expiry dates and validity so you are warned before a certificate lapses. It is a planned MonitorUrs capability designed to alert you well ahead of expiry.

Is SSL certificate monitoring available in MonitorUrs today?

Not yet. SSL certificate monitoring is on the MonitorUrs roadmap and is not yet generally available. In the meantime you can monitor your HTTPS sites and endpoints for availability and content today using HTTP probes, with alerts via Telegram, SMS and Email.

Why do expiring SSL certificates cause outages?

When a TLS/SSL certificate expires, browsers and clients refuse the connection and show a security warning, effectively taking the site offline for most visitors. Because certificate renewals are easy to forget and automated renewals can silently fail, expiry is one of the most common avoidable causes of downtime.

How will MonitorUrs alert me about certificate expiry?

The planned capability is designed to send alerts through the same channels MonitorUrs already uses — Telegram, SMS and Email — warning you a configurable number of days before a certificate expires and again if it becomes invalid, so you have time to renew.

Can I monitor my HTTPS websites with MonitorUrs right now?

Yes. MonitorUrs monitors HTTPS URLs as HTTP probes today, sending a request on a configurable interval and checking the status code and response content. You get instant alerts via Telegram, SMS and Email after a consecutive-failure threshold, which already catches the downtime an expired certificate causes.