Security is a key consideration as you set up your thin client environment. By its very nature, in a thin client environment traffic is flowing in to and out from your network.
You should consider setting up a firewall to limit access to your data and enforce your organization's access control policy. When you set up a firewall, you'll need to indicate the "port number" through which the thin client, AcuLaunch, and the ACUCOBOL-GT runtime can communicate. The default port number for both the thin client and AcuLaunch is 5632. You can also indicate these settings through the configuration variables. Use the ATC_PORT configuration variable for the thin client and the ACURCL_PORT configuration variable for AcuLaunch.