EC2 InvalidVpcEndpointServiceAllowedPrincipalID.Malformed error encountered when configuring VPC endpoint service.

What is EC2 InvalidVpcEndpointServiceAllowedPrincipalID.Malformed error encountered when configuring VPC endpoint service.

Understanding Amazon EC2 and VPC Endpoint Services

Amazon Elastic Compute Cloud (EC2) is a web service that provides resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers. One of the features of EC2 is the ability to create VPC (Virtual Private Cloud) endpoint services, which allow you to privately connect your VPC to supported AWS services and VPC endpoint services powered by AWS PrivateLink.

Identifying the Symptom: InvalidVpcEndpointServiceAllowedPrincipalID.Malformed

When configuring a VPC endpoint service, you might encounter the error code InvalidVpcEndpointServiceAllowedPrincipalID.Malformed. This error indicates that the specified VPC endpoint service allowed principal ID is not in the correct format.

What You Observe

During the setup or modification of a VPC endpoint service, the operation fails with an error message stating that the principal ID is malformed. This prevents the successful creation or update of the endpoint service.

Exploring the Issue: Malformed Principal ID

The error InvalidVpcEndpointServiceAllowedPrincipalID.Malformed arises when the principal ID provided does not adhere to the expected format. A principal ID is typically an AWS account ID or an IAM role/user ARN that is allowed to access the VPC endpoint service.

Common Causes

Typographical errors in the principal ID. Using an incorrect format, such as missing the 'arn:aws:iam::' prefix for IAM roles or users. Providing an invalid AWS account ID that does not exist.

Steps to Fix the InvalidVpcEndpointServiceAllowedPrincipalID.Malformed Error

To resolve this issue, follow these steps to ensure the principal ID is correctly formatted:

Step 1: Verify the Principal ID Format

Ensure that the principal ID is in the correct format. For AWS account IDs, it should be a 12-digit number. For IAM roles or users, it should be in the ARN format, such as arn:aws:iam::123456789012:role/RoleName.

Step 2: Check for Typographical Errors

Double-check the principal ID for any typographical errors. Ensure that all characters are correct and that there are no extra spaces or missing characters.

Step 3: Use the AWS Management Console or CLI

Use the AWS Management Console or AWS CLI to update the VPC endpoint service configuration. Here is an example command using the AWS CLI:

aws ec2 modify-vpc-endpoint-service-permissions \ --service-id vpce-svc-0123456789abcdef0 \ --add-allowed-principals arn:aws:iam::123456789012:role/RoleName

For more details on using the AWS CLI, refer to the AWS CLI Command Reference.

Additional Resources

For further information on VPC endpoint services and managing permissions, you can visit the following resources:

VPC Endpoint Services Documentation IAM Identifiers

By following these steps and ensuring the correct format, you should be able to resolve the InvalidVpcEndpointServiceAllowedPrincipalID.Malformed error and successfully configure your VPC endpoint service.