The Network Access Control List (NACL) function provide stateless filtering of ingress and egress network traffic to AWS resources. It is recommended that no NACL allows unrestricted ingress access to remote server administration ports, such as SSH to port 22 and RDP to port 3389.
Perform the following in the AWS Management Console:
1. Login to the AWS Management Console at https://console.aws.amazon.com/vpc/home
2. In the left pane, click Network ACLs.
3.For each network ACL to remediate, perform the following: