Ubiquity UAP-LR Port Issue How to change, what ports should be used?

Hi there,
I have a small network running on SBS 2003.  I recently bought a 3 pack of the Ubiquity UAP-LR Access points.  Upon installing the software on the server (which coordinates and sets the settings for the AP's, It comes up with the following error upon opening.
This is the Unifi Controller application.
Initializing Unifi Controller
Starting Unifi Controller
Port 8081 is used by other programs.

I found info on how to go in and change the ports that are used, but what ports will work that will likely not be used by other programs?

Here is the wiki info
 How can I run UniFi Controller on different ports

    By default, UniFi controller runs on these ports
        unifi.shutdown.port=8081 (for management purpose)
        unifi.http.port=8080 (device inform)
        unifi.https.port=8443 (controller UI / API)
        portal.http.port=8880 (portal redirect port for HTTP)
        portal.https.port=8843 (portal redirect port for HTTPs)
        unifi.db.port=27117 (local-bound port for DB server)
    Follow these steps to change the default settings
        Make sure UniFi is not running
        modify <unifi_base>/data/system.properties and make sure all ports needed by UniFi are available
        restart UniFi

As I am running this on an SBS 2003, I need to not bump into ports that may be in use.
I have a Xywall firewall/router connected to a T-1 if that helps.  Most other things should be fairly standard.

Thanks,
Dave