Man, I wish I had found this thread last night when I installed my ISY! For some reason, I have no "Show icons for networked UPnP devices" so I have no My Lighting icon. I simply (ha ) worked out the direct http link method from some other threads in the forum.
To find that unique port for the ISY, I made a serial connection through the Com port to the ISY shell. In addition to that port, I also used the shell to find the MAC address of the unit. It is listed in the output of a reboot.
jgraziano, instead of assigning a static IP to your ISY outside of your DHCP pool, if you have more advanced router, you maybe able to assign what is called a "static" DHCP address to the ISY. This allows the router to assign the same IP to the designated MAC address if it is present on the network and re-use that IP for some other device if that device isn't present. I had to do this because of some network complications in which I end up with two DHCP servers and the secondary server was making the wrong IP assignment on the ISY. The static DHCP method forced the correct IP to the ISY.
I found that I couldn't simply set the ISY to a static IP if a DHCP server was present on the network. After entering all the new IPs and mask, a reboot simply erased the entered data and re-acquired the DHCP IP.