IBM Cloud VPC: Routing Private Subnet Traffic Through a NAT Gateway
Give private-subnet VSIs outbound internet access without assigning floating IPs to every instance. Compare NAT gateways with public gateways and verify the route.
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Diagnosing and Fixing Outbound SNAT Port Exhaustion on Azure VMs, VMSS, AKS, and App Service
Outbound calls timing out under load while CPU and memory look healthy often means SNAT port exhaustion. Confirm it with Load Balancer metrics, then fix it with NAT Gateway, connection reuse, or scale-out.