alibabacloud-ecs-vpc-publicnetwork-troubleshoot

Use when an ECS instance cannot reach the internet, its public IP is unreachable, ping to the public network times out, a security group blocks public access, or a VPC cloud service (DataWorks / SAE / ACK) cannot access the public network. Diagnoses Alibaba Cloud ECS public network access and VPC cloud service public egress: ECS public IP reachability and security-group blocking (auto-handling the NAT-gateway egress path for instances without a public IP), plus NAT gateway / SNAT / route / EIP checks for DataWorks, SAE, ACK and others. Triggers: "ECS public network access diagnosis", "ECS publ