How do I resolve the AWS CloudFormation error “Route did not stabilize in expected time”?

Issue

I tried to create an AWS CloudFormation stack but it failed with the error "Route did not stabilize in expected time." How do I fix this?

Short Description

This error occurs when assigning the wrong values to either the GatewayId property or the NatGatewayId property of the AWS::EC2::Route type.

For example, in the following snippet the value of a NatGatewayId property is assigned to the GatewayId property:

MyRoute":
{
     "Type" : "AWS::EC2::Route",
         "Properties" :  {
          "DestinationCidrBlock" : "0.0.0.0/0",
          "GatewayId" : "nat-0a12bc456789de0fg",
          "RouteTableId" : {"Ref":"MyRouteTable"}
     }
}

Resolution

Be sure that you assign the correct value to the corresponding property. For example:

"GatewayId" : "igw-eaad4883"
    -or-
"NatGatewayId" : "nat-0a12bc456789de0fg"

Important: Specify only one of the following properties for your AWS::EC2::ROUTE resource.

AWS::EC2::ROUTE

AWS::EC2::VPCPeeringConnection

Route Tables

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Published: 2015-08-31

Updated: 2018-04-10