Use Maximum Dynamic Server (-maxport) to specify the highest port number in a specified range of port numbers accessible to a client. You specify the lowest port number with the -minport parameter. The range of port numbers defined by the -maxport and -minport parameters provides client access to an OpenEdge server that is behind a firewall. Some operating systems choose transient client ports in the 32,768-to-65,535 range. Choosing a port in this range might produce unwanted results.