title: AWS Websocket API Gateway pigwManagementApi.postToConnection time out Lambda + VPC
body: <p>I have implemented WebSockets using AWS lambda and API gateway, it seemed to work fine until I moved it behind a VPC, right now I am able to connect to the WSS and it is able to communicate with dynamodb (through VPC endpoint) but when I try to send data to a connected connection: apigwManagementApi.postToConnection(xxx)
  I get timeout (lambda function times out)</p>