title: Adding AWS Lambda with VPC configuration causes timeout when accessing S3
body: <p>I am trying to access S3 and resources on my VPC from AWS Lambda but since I configured my AWS Lambda to access VPC it's timing out when accessing S3.
  Here's the code</p>
  
  <pre><code>from __future__ import print_function
  
  import boto3
  import logging
  import json
  
  print('Loading function')
  
  s3 = boto3.resource('s3')
  
  import urllib
  
  def lambda_handler(event, context):
      logging.getLogger().setLevel(logging.INFO)
      # Get the object from the event and show its content type
      bucket = event['Records'][0]['s3']['bucket']['name']
      key = urllib.unquote_plus(event['Records'][0]['s3']['object']['key']).decode('utf8')
      print('Processing object {} from bucket {}. '.format(key, bucket))
      try:
          response = s3.Object(bucket, key)
          content = json.loads(response.get()['Body'].read())
          # with table.batch_writer() as batch:
          for c in content:
              print('     Processing Item : ID' + str(c['id']))
              # ##################
              # Do custom processing here using VPC resources
              # ##################
      except Exception as e:
          print('Error while processing object {} from bucket {}. '.format(key, bucket))
          print(e)
          raise e
  </code></pre>
  
  <p>I've set my subnets and security groups with appropriate Outbound rules to access internet as shown below but my Lambda simply times out when accessing S3.</p>
  
  <p><a href="https://i.stack.imgur.com/SCijw.png" rel="noreferrer"><img src="https://i.stack.imgur.com/SCijw.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/UDUFf.png" rel="noreferrer"><img src="https://i.stack.imgur.com/UDUFf.png" alt="enter image description here"></a></p>
  
  <p>Here's a sample of test input as well</p>
  
  <pre><code># Test Event Configuration
  {
    "Records": [
      {
        "awsRegion": "us-east-1",
        "eventName": "ObjectCreated:Put",
        "eventSource": "aws:s3",
        "eventTime": "2016-02-11T19:11:46.058Z",
        "eventVersion": "2.0",
        "requestParameters": {
          "sourceIPAddress": "54.88.229.196"
        },
        "responseElements": {
          "x-amz-id-2": "ljEg+Y/InHDO8xA9c+iz6DTKKenmTaGE9UzHOAabarRmpDF1z0eUJBdpGi37Z2BU9nbTh4p7oZg=",
          "x-amz-request-id": "3D98A2325EC127C6"
        },
        "s3": {
          "bucket": {
            "arn": "arn:aws:s3:::social-gauge-data",
            "name": "social-gauge-data",
            "ownerIdentity": {
              "principalId": "A1NCXDU7DLYS07"
            }
          },
          "configurationId": "b5540417-a0ac-4ed0-9619-8f27ba949694",
          "object": {
            "eTag": "9c5116c70e8b3628380299e39e0e9d33",
            "key": "posts/test/testdata",
            "sequencer": "0056BCDCF1F544BD71",
            "size": 72120
          },
          "s3SchemaVersion": "1.0"
        },
        "userIdentity": {
          "principalId": "AWS:AROAIUFL6WAMNRLUBLL3K:AWSFirehoseDelivery"
        }
      }
    ]
  }
  </code></pre>