ExtendSim uses port 5053 and the license file (extendsim.lic) that you paste on the Client device to automatically find the Server. If ExtendSim can’t find the Server, it will present an error message with some possible reasons. If none of the reasons apply, clicking yes on that error message allows you to browse to the Server (path, IP address, computer name, or URL). That info is saved in a host.lic file on the Client device so it doesn’t ask again. Note: the URL must be resolvable to an external IP address.