EC2 InvalidVpcPeeringConnectionID.Malformed

What is EC2 InvalidVpcPeeringConnectionID.Malformed

Understanding Amazon EC2 and VPC Peering

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 Virtual Private Clouds (VPCs), which are isolated networks that can be connected through VPC peering.

Identifying the Symptom

When working with VPC peering connections in Amazon EC2, you might encounter the error code InvalidVpcPeeringConnectionID.Malformed. This error indicates that the VPC peering connection ID you have specified is not in the correct format.

What You Observe

Typically, this error is observed when attempting to describe, accept, or delete a VPC peering connection using the AWS Management Console, AWS CLI, or AWS SDKs. The operation fails, and the error message is displayed.

Details About the Issue

The error InvalidVpcPeeringConnectionID.Malformed arises when the format of the VPC peering connection ID does not match the expected pattern. A valid VPC peering connection ID typically starts with pcx- followed by a series of alphanumeric characters.

Common Causes

Typographical errors in the ID. Using an ID from a different AWS region. Attempting to use a non-existent or deleted peering connection ID.

Steps to Fix the Issue

To resolve the InvalidVpcPeeringConnectionID.Malformed error, follow these steps:

1. Verify the Peering Connection ID

Ensure that the VPC peering connection ID is correctly formatted. It should look something like pcx-0123456789abcdef0. Double-check for any typographical errors.

2. Use the Correct AWS Region

Ensure that you are operating in the correct AWS region where the VPC peering connection was created. You can set the region in the AWS CLI using:

aws configure set region us-west-2

Replace us-west-2 with your specific region.

3. List Existing Peering Connections

Use the AWS CLI to list all VPC peering connections and verify the correct ID:

aws ec2 describe-vpc-peering-connections

Look for the correct ID in the output.

4. Check for Deletion

If the peering connection ID was recently deleted, it will no longer be valid. Ensure that the ID corresponds to an active peering connection.

Additional Resources

For more information on VPC peering, visit the AWS VPC Peering Documentation. For troubleshooting AWS CLI issues, refer to the AWS CLI Troubleshooting Guide.