Error creating AWS VPC: There was an error creating your VPC: Unable to find main route table for vpc

Question

I have tried creating a VPC twice now and both times it's errored out with:

There was an error creating your VPC: Unable to find main route table for vpc: vpc-02de8520acae014f4

I've tried using the following settings:

• Used the wizard to choose public + private
• IPv4 CIDR: 10.0.0.0/16 (no IPv6)
• VPC Name: myvpc
• Public subnet:
  • CIDR 10.0.10.0/24
  • AZ: us-east-1a
  • Name: Public Subnet A
• Private subnet:
  • CIDR 10.0.20.0/24
  • AZ: us-east-1a
  • Name: Private Subnet A
• NAT gateway:
  • Elastic IP Allocation ID: (entered an elastic ip I created)

I can't seem to find any more info beyond that error. This is a new AWS account and I've never created anything else in here. I'm on an account that has the AdministratorAccess policy.

Answer 1

This error will result if you had existing subnets using the same exact private IP address. The private IP address consists of your vpc ip address + subnet ip address. IF this is in fact the case, the subnets will not be created and the public ip address will obviously not be associated with the non created public subnet. The error message doesn't reflect the real issue though, not sure why AWS can't return a better one. In fact, if you look at the new vpc details, you will see a route table attached to it, so the error message is completely off