title: AWS wont let me delete custom Security Groups that I had created
body: <p>I am new to AWS and,</p>
  
  <p>Here's the drill:
  - Logged in to AWS with root admin credentials.
  - I created few security groups in AWS.
  - Terminated all the EC2 instances that I had.
  - Deleted ELB successfully.
  - Deleted RDS successfully.
  - Using default VPC and no Elastic IPs.</p>
  
  <p>Now, when I am trying to delete security groups, one group says its being referenced by another. When I try to delete the referenced one, it says that the security group is being referenced by a Network Interface.</p>
  
  <p>We get two options here- <strong>Associate with another group or Delete that Network Interface</strong>. 
  Trying first makes no sense as I want to get rid of all the Security Groups except the default (Like it was in the beginning). Still I tried that option and got the error "<strong>You do not have permission to access the specified resource</strong>" and it did not let me associate that Network Interface (Status-In Use) with any Security Group.
  Tried deleting/detaching(force) that Network Interface and got an error message "<strong>You do not have permission to access the specified resource</strong>."</p>
  
  <p>A similar issue can be found below without any known solution:
  <a href="https://forums.aws.amazon.com/thread.jspa?threadID=99189&amp;start=0&amp;tstart=0" rel="nofollow noreferrer">https://forums.aws.amazon.com/thread.jspa?threadID=99189&amp;start=0&amp;tstart=0</a></p>
  
  <p>Unresolved Stackoverflow link: <a href="https://stackoverflow.com/questions/37232965/issue-in-deleting-vpc-and-network-interface">issue in deleting VPC and network interface</a></p>
  
  <p>I would really appreciate if someone hits me with a hammer of facts :)</p>
  
  <p>Thanks, in advance!</p>