Just tried this for the umpteenth time, but then decided to check my gateway modem/router settings.
And now, officially feeling like a foolish noobie. My wife complained today about a printer not working. When power went out, my router must have lost its static IP assignments including ISY (and the aforesaid printer). I went into router web interface to view the devices and saw the different IP assigned through DHCP. So ISY finder was using one from a previous load. Now updated and fixed. Sorry for the post before bottoming out some other obvious causes.
