How to check the network configuration of the back-end ECS where endpoint services are located?

Check whether the NIC security group used by the ECS is correct.
View the security group used by the NIC on the ECS details page.
Check whether the addresses of the 198.19.128.0/20 network segment are released in the inbound direction of the security group. If they are not released, please add the inbound rules of the 198.19.128.0/20 network segment. You can add inbound rules based on actual business scenarios.

Ensure that the subnet ACL of the ECS NIC does not block traffic.
On the left side of the VPC page, if you can configure the network ACL, please confirm that the subnet involved in the peering connection has been released.

What's the difference between VPC endpoint and VPC peering?

For details about the differences between VPC endpoints and peering connections, see the following table.

Type	VPC Peering Connection	VPC Endpoint
Security	All ECSs and ELBs in a VPC can be accessed.	Only the ECSs and ELBs that have been created with VPC Endpoint Service can be accessed.
CIDR overlap	Not supported.If the subnetwork segments of two VPCs overlap or are identical, the peering connection is invalid and intercommunication is not available.	Supported.VPC endpoints are not affected by two overlapping or identical VPC subnetwork segments, and can communicate with each other properly.
Communication direction	Two-way communication is supported between two VPCs that have been created with a peering connection.	When two VPCs are connected through a VPC endpoint, only the VPC where the endpoint is located can access the designated port of the backend resources of the VPC Endpoint Service.
Route configuration	After a peering connection is created between two VPCs, you need to add peering connection routing information to the VPCs at both ends to realize mutual communication.	For the two VPCs connected through the VPC Endpoint Service, corresponding routing information has been configured, saving the trouble of configuration for users.
Billing	Free	It is free during the public beta and is billed as per use after the public beta.

VPC Endpoint

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