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Systematically diagnose network connectivity issues in a cloud environment, using ping, traceroute, mtr, DNS resolution checks, and firewall rule analysis to identify whether the problem is DNS, routing, firewall, or application-level.
## Problem
Service A in your AWS VPC cannot reach Service B. Connections time out after 30 seconds. Both services were communicating successfully until 2 hours ago. Walk through your systematic diagnosis process, from verifying DNS resolution to checking every network layer that could block the connection.
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