Security Rules in AWS are simple. Just add a rule that allows Big Business to connect.
In AWS, go to Instance Summary, Security tab and click on the link to Security Group. Click Edit Inbound Rules, click Add Rule, choose Custom TCP, for Port Range type in "19812-19814", and for Source leave on Custom, click in search, and choose 0.0.0.0/0.
Click Save Rules or review details here to choose best settings for your security needs.