Test if a Service Port Is Open
Confirm connectivity before blaming the application or firewall.
Use this when: Confirm connectivity before blaming the application or firewall.
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Command
Test-NetConnection server01 -Port 443When to use it
Confirm connectivity before blaming the application or firewall. This belongs in the first few minutes of triage, before deep investigation.
What to look for
- Recent reboots or unexpected service restarts.
- Resource exhaustion that matches the alert.
- Connectivity failures that explain application symptoms.
- Differences between monitoring data and the server's actual state.
Manager note: Quick fixes should reduce triage time, not replace root cause analysis. If the same quick fix is used repeatedly, turn it into a problem record or permanent monitoring change.
Related: All Playbooks · Quick Fix Library · Deep Guides