Github user ahgittin commented on the pull request:

    https://github.com/apache/incubator-brooklyn/pull/705#issuecomment-114345523
  
    Okay, I've added a more helpful error if this situation is encountered, and 
that seems to be working:
    
    | 2015-06-22 20:30:33,643 ERROR Detected that your EC2 account is a legacy 
'classic' account, but the recommended instance type requires VPC. You can 
specify the 'eu-central-1' region to avoid this problem, or you can specify a 
classic-compatible instance type, or you can specify a subnet to use (taking 
care that the subnet auto-assigns public IP's, or Brooklyn can see the subnet 
or is configured to use a jump host for this location). For more information 
see http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-vpc.html.
    
    However the "fixes" aren't working:
    
    * `networkName: subnet-ID` gives the same `VPCResourceNotSpecified` error; 
maybe the syntax is off?
    
    * `eu-central-1` (VPC) gives 
`com.google.common.util.concurrent.UncheckedExecutionException: 
java.lang.RuntimeException: security group 
eu-central-1/jclouds#brooklyn-bxza-alex-eu-central-shoul-u2jy-nginx-ielm is not 
available after creating` -- I saw one of those pages suggested max security 
groups was 5, so maybe that's it
    
    I'm investigating.


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