Hi Milind, Use of Existing VPC thing is not working in our case with the new template. With the new parameter in template it is allowing for selecting the existing VPC, but while creating the cloud break instance it is still creating the new VPC and launching the cloudbreak EC2 instance in the new VPC and not using the existing vpc subnet. Fixing the same will be helpful for us. I'm not expert in cloud formation template but looks like you have added the new parameters, but the previous existing parameter in template still overwriting them. ... View more