During the installation of an EC2 instance on AWS, when you get to step 5 per these instructions (https://www.3cx.com/docs/pbx-amazon-aws-marketplace/) you can not proceed, when you try to configure ports 9000-10999 you get an error (see screenshot). You can setup two rules 9000-9999 and 10000 - 10999, that seems to work. Any idea what is going on here?
