Release 10.1A: OpenEdge Getting Started:
Installation and Configuration

> ## Accessing a server behind a firewall

> OpenEdge allows you to use the Minimum Dynamic Server Port (-`minport`) and the Maximum Dynamic Server Port (-`maxport`) server startup parameters to provide client access to an OpenEdge server that is behind a firewall. This communication is possible only when the access to the server can be limited. You supply this limit when you specify a group of port numbers with the -minport and -maxport parameters.

> For example, suppose you start the following two login brokers:

>     proserve db -S demosv1 -N tcp -H myhost -minport 4000 -maxport 4040
>     proserve db -S demosv2 -N tcp -H myhost -minport 4041 -maxport 4080 -m3

> A client requesting a connection from the first broker, `demosv1`, is assigned a port number in the range of 4000 to 4040. The 4000-to-4040 range limits access to the server by limiting communication to just 40 ports.

> The default for -`minport` is 1025 for all platforms. Ports lower than 1025 are usually reserved for system TCP and UDP. The default for -`maxport` is 2000 for all platforms. Remember that some operating systems choose transient client ports in the 32768-to-65535 range. Choosing a port in this range might produce unwanted results.

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