01
Test DNS resolution and endpoint selection
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GitHub Actions Academy · Troubleshooting Center
Connectivity Failure
Diagnose name resolution, routing, filtering, endpoints and application reachability.
Objective: Separate network symptoms from service and identity causes.
Practical guidance
Diagnostic sequence
02
Trace routes and network boundaries
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03
Check security rules, firewalls and proxies
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04
Validate listeners, ports and certificates
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05
Compare working and failing paths
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