# Neo4j Causal Clustering Fails to Start with cloudformation

**URL:** <https://community.neo4j.com/t/neo4j-causal-clustering-fails-to-start-with-cloudformation/31885>\
**Category:** Installation\
**Tags:** aws\
**Created:** [January 12, 2021, 2:57am UTC](https://community.neo4j.com/t/neo4j-causal-clustering-fails-to-start-with-cloudformation/31885 "2021-01-12T02:57:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![diego.ulloa13](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/diego.ulloa13/32/4090_2.png) [@diego.ulloa13](https://community.neo4j.com/u/diego.ulloa13)\
**Post date:** [January 12, 2021, 2:57am UTC](https://community.neo4j.com/t/neo4j-causal-clustering-fails-to-start-with-cloudformation/31885/1 "2021-01-12T02:57:10Z")

</div>

Hi everyone.

I have failed to start a causal cluster in AWS with this product from the marketplace [AWS Marketplace: Neo4j Enterprise Causal Cluster](https://aws.amazon.com/marketplace/pp/Neo4j-Neo4j-Enterprise-Causal-Cluster/B07D441G55)

When I deploy the cloudformation process I got this first error:

 ![image](https://us1.discourse-cdn.com/flex021/uploads/neo4jcommunity/original/3X/2/b/2b1ed26539b706752c39ce5a2f4d9883f93c8d48.png)

After that, I got this several errors that conclude with a rollback

 ![neo4j12](https://us1.discourse-cdn.com/flex021/uploads/neo4jcommunity/original/3X/7/a/7a0c5e18785b7bbd62a9540da7641dd734ed5fa8.png)

I have sent a ticket to AWS and they answered me with a solution:

_The solution to this is to create at least one new subnet in each Availability Zone. This should be marked as default automatically._

After several attempts, I noticed that the cloudformation template is trying to create a new VPC but I think that the process fails because there are no available subnets for that VPC.  
With that in mind, I was thinking that a possible solution could be to create/use a custom VPC with subnets in each available zone but I found that this approach could be more difficult according to this: [Deploying Neo4j on AWS Using CloudFormation - Knowledge Base](https://neo4j.com/developer/kb/deploy-aws-cloudformation/)

At this point, I still believe that the problem is related to the subnets? Maybe the subnet creation in the cloudformation?

I would appreciate any help/solution to this.

**UPDATE** : I could solve this problem by creating three default subnets in different availability zones via CLI commands. I didn't need to change the cloudformation template.