Received Server.InternalError while changing the EC2 instance type

Question

Hi, I received Server.InternalError when changing the EC2 instance type from r5dn.24xlarge to r5dn.16xlarge. The following is the error message I received from Instance diagnostics. I would appreciate it if you could provide me with a solution. Thanks.

"eventTime": "2025-09-20T02:06:18Z",
    "eventSource": "ec2.amazonaws.com",
    "eventName": "ModifyInstanceAttribute",
    "awsRegion": "us-east-1",
    "sourceIPAddress": "x.x.x.x.",
    "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36",
    "errorCode": "Server.InternalError",
    "errorMessage": "An internal error has occurred",
    "requestParameters": {
        "instanceId": "i-aaaaaaaaaaaaa",
        "instanceType": {
            "value": "r5dn.16xlarge"
        }
    },
    "responseElements": null,
    "requestID": "3eae7164-0181-4b51-951f-7f96d63f1b95",
    "eventID": "702f336f-1741-4778-9fb3-75a4772e6237",
    "readOnly": false,
    "eventType": "AwsApiCall",
    "managementEvent": true,
    "recipientAccountId": "123456789012",
    "eventCategory": "Management",
    "tlsDetails": {
        "tlsVersion": "TLSv1.3",
        "cipherSuite": "TLS_AES_128_GCM_SHA256",
        "clientProvidedHostHeader": "ec2.us-east-1.amazonaws.com"
    },
    "sessionCredentialFromConsole": "true"

AllenLiu · Accepted Answer

If you have EFA configured with this instance. According to the instance specs [1], r5dn.24xlarge supports EFA but r5dn.16xlarge doesn't, which may cause some issues when changing the instance type.

re:Post Agent · Answer

The "Server.InternalError" you're experiencing when trying to change your EC2 instance type from r5dn.24xlarge to r5dn.16xlarge indicates an issue on AWS's side rather than a problem with your configuration or request.

Here are some steps you can take to resolve this issue:

1. Wait and retry: Since this is an internal server error, the issue might be temporary. Wait a few minutes and try the operation again.

2. Stop the instance first: Make sure your instance is completely stopped before attempting to change the instance type. The instance must be in the 'stopped' state to modify its type.

3. Try a different approach: If you're using the AWS Management Console, try using the AWS CLI or SDK instead, or vice versa.

4. Check for compatibility: Ensure that the new instance type is compatible with your current configuration. Although both instance types are in the same family (r5dn), there might be specific compatibility issues.

5. Contact AWS Support: If the error persists after multiple attempts, reach out to AWS Support for assistance. They can investigate the specific internal error that's occurring.

Remember to back up any important data before making changes to your instance, especially if it contains data on instance store volumes. Also, if you're not using an Elastic IP address, be aware that your public IP address might change when you stop and start the instance.  
**Sources**  
[Error codes for the Amazon EC2 API - Amazon Elastic Compute Cloud](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/errors-overview.html)  
[Amazon EC2 instance type changes - Amazon Elastic Compute Cloud](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-resize.html)  
[Change EC2 instance type | AWS re:Post](https://repost.aws/questions/QUqnnC0uIqRMywnNVAoIIyaA/change-ec2-instance-type)

Received Server.InternalError while changing the EC2 instance type

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