# Know why a website is down, not only that it is down.

> Monitor website, API, HTTP, TCP, DNS, SSL, and keyword availability with clear failure evidence and regional verification.

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

Uptime monitoring

Sentryx monitors customer-facing endpoints from outside your infrastructure. Each alert includes timing, response status, IP context, and the likely failure layer: DNS, TCP, TLS, or HTTP.

[Scan domain free](https://sentryxmonitor.com/services/uptime-monitoring/#scan) [View pricing](https://sentryxmonitor.com/#pricing)

Alert evidence live checks

**DNS**resolved in 10 ms

pass

**TCP**connected in 4 ms

pass

**TLS**certificate valid

pass

**HTTP**timed out before a response

fail

Supported checks

## Monitor endpoints the way users reach them.

A failure can start in DNS, a closed port, TLS, an unexpected status code, a slow application, or missing page content. Each layer needs different evidence.

### HTTP and keyword checks

Monitor status codes, response time, redirects, timeouts, and page content for websites, APIs, landing pages, and customer portals.

### TCP, DNS, and SSL checks

Watch the layers that can fail before an application receives a request: DNS resolution, socket connectivity, certificate validity, and TLS handshake.

### Alerts with context

Send email or Telegram alerts with the host, method, timestamp, IP, network context, likely failure layer, and recovery time.

Regional verification

## Separate a real outage from internet noise.

A CDN edge, DNS route, WAF rule, or regional network path can fail for one checker while remaining reachable elsewhere. Peer-region evidence helps classify the event more accurately.

Healthy

The primary check passes and the endpoint is reachable. No action is needed.

Regional degradation

One path cannot reach the host while a peer region still sees it online. Investigate routing, CDN, or WAF behavior.

Confirmed outage

The primary failure and peer-region evidence agree that the endpoint is unavailable.

Free domain scan

## Find the endpoints that deserve monitoring.

Start with a domain, then turn important hosts into uptime checks.

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