Cloudformation: update stack error Service: ElastiCache, Status Code: 400

Question

Hi, 
Im using cdk to to create a stack with a redis cluster

```javascript
       const subnets = vpc.privateSubnets.map(subnet => subnet.subnetId);
       const subnetGroups = new CfnSubnetGroup(
            this,
            'redisSubnets',
            {
                description: 'redis-subnets-${environmentName}',
                subnetIds: subnets
            }
        );
        new RedisLogs(
            this,
            'redisClusterLogs',
            environmentName
        );

const logsDeliveryConfiguration: CfnCacheCluster.LogDeliveryConfigurationRequestProperty = {
            logFormat: 'json',
            logType: 'slow-log',
            destinationDetails: {
                cloudWatchLogsDetails: {
                    logGroup: `/redis/${environmentName}`
                }
            },
            destinationType: 'cloudwatch-logs'
        };

const clusterProps: CfnCacheClusterProps = {
            cacheNodeType: 'cache.t3.micro',
            engine: 'redis',
            numCacheNodes: 1,
            autoMinorVersionUpgrade: true,
            vpcSecurityGroupIds: [securityGroup.securityGroupId],
            cacheSubnetGroupName: subnetGroups.ref,
            clusterName: `cluster-${environmentName}`,
            logDeliveryConfigurations: [logsDeliveryConfiguration],
            engineVersion: "6.2"
        };

this.redisCluster = new CfnCacheCluster(
            this,
            'redis-cluster',
            clusterProps
        );

this.redisCluster.addDependsOn(subnetGroups)
```

cloudformation fails with this error into resource redisSubnets:

```
Resource handler returned message: "No modifications were requested. (Service: ElastiCache, Status Code: 400, Request ID: xxxxxxxx)" (RequestToken: xxxxxxx, HandlerErrorCode: GeneralServiceException)

```

Im using the same code for develop, certification environments, only in test environment causes this error
This stack is in a bigger stack with several nested stacks like ecs, rds and another services, curiously, redis stack not have any changes

Aditi_B · Answer

Hello,

Greetings of the day!! Thank you for contacting AWS.

I understand you are getting the following error "Resource handler returned message: "No modifications were requested." while creating a stack with Redis cluster via CDK and though the code works well for production environment, it is failing for the test environment where no changes were made to the Redis stack.

To answer your question, we require details that are non-public information. Please open a support case with AWS using the following link https://console.aws.amazon.com/support/home#/case/create

Thank you and have a nice day!!

capaj · Answer

I had this when I changed subnets in my VPC. I have added new ACL to make my subnets private, so I had to change from
![Enter image description here](/media/postImages/original/IMWSSaoCArSrOPRuNNezT8_w)

Cloudformation: update stack error Service: ElastiCache, Status Code: 400

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