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Network Access Control Lists (ACL) do not allow unrestricted outbound traffic


A Network ACL acts as a stateless, virtual firewall that controls traffic at the subnet level. The default Network ACL associated with a Virtual Private Cloud (VPC) allows all inbound and outbound traffic. For security purposes, best practices recommend restricting outbound Network ACLs.


  1. Log in to the AWS Management Console.
  2. Select Services.
  3. Select VPC.
  4. Select Network ACLs.
  5. Select the Network ACL to edit.
  6. Select the Outbound rules tab.
  7. Select Edit outbound rules.
  8. For each rule, restrict access to only the appropriate port or port range.
  9. Select Save changes.