That’s the pain point of outbound-only connectivity. Your service can send data out, but nothing can reach in. Firewalls, NAT, security policies, and network restrictions all block inbound calls. This behavior is common in secure environments, enterprise networks, and cloud deployments with locked-down VPCs. It protects systems, but it cripples integration.
Outbound-only connectivity means every interaction has to be initiated from inside. Webhooks fail. Real-time event streams dry up. APIs that expect inbound traffic become unreachable. You lose critical observability and responsiveness.
Engineers end up building workarounds: polling APIs, scheduling jobs to check for changes, tunneling through bastion hosts, or setting up reverse proxies that invite complexity and risk. Each hack adds latency, resource costs, and new failure modes. The original simplicity of the design is gone.