Port reachability
Detect closed or blocked ports before production impact.
Monitor Type
Port Monitoring
Validate that required service ports are reachable and accepting connections.
What this monitor checks
Network path
Surface routing issues between monitor location and host.
Service readiness
Confirm essential services are listening as expected.
Common use cases
SMTP availability
Ensure email delivery infrastructure remains reachable.
VPN gateways
Track secure access endpoints for team and partner connectivity.
Infra checks
Watch core networked services that upstream systems depend on.
Implementation blueprint
1. Define critical targets
Start with services and workflows that create direct customer or revenue impact.
2. Tune alert thresholds
Use warning and critical layers so on-call responders get signal without alert fatigue.
3. Validate escalation flow
Simulate failures and verify acknowledgement, assignment, and recovery behavior end-to-end.
Suggested thresholds
| Signal | Recommended baseline | Escalate when |
|---|---|---|
| Port reachability | >= 99.95% | < 99.8% for 5 minutes |
| Handshake time | < 300ms | > 800ms for 3 checks |
| Refusal events | 0 | >= 2 consecutive refusals |
FAQ
What does port monitoring prove?
It confirms socket availability and network reachability for exposed services.
Does an open port mean the app is healthy?
No. Pair port checks with HTTP/API checks for full application validation.
Should internal and external ports be separate monitors?
Yes. Separate monitors help isolate perimeter issues from internal service failures.
Related monitor types
HTTP Monitoring
Pair this monitor to increase coverage and improve incident triage confidence.
Hardware Monitoring
Use together to reduce blind spots and catch degradation before customer impact.
Choose your preferred alert channels
Notify the right responders instantly across channels your team already uses.
Email and SMS
Deliver rapid alerts with fallback channels for critical incidents.
Slack and Teams
Route monitor events directly into team collaboration channels.
Webhooks and integrations
Trigger downstream workflows in PagerDuty, Opsgenie, and internal tools.
Advanced capabilities included
Multi-location monitoring
Run checks from multiple regions to isolate local routing issues from global outages.
Maintenance windows
Pause checks during planned maintenance to keep alert noise low and signal clear.
Recurring notifications
Keep stakeholders informed when incidents remain open for longer durations.
Status communication
Coordinate internal and customer updates with status page friendly incident workflows.
What teams value most
"We moved from delayed outage discovery to immediate, actionable alerts with clear ownership."
Deploy Port Monitoring checks quickly
Create your monitor, define escalation policy, and start getting reliable signal in minutes.