Solutions
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Techman's post in Starlink and ISY994i and Insteon was marked as the answer@DirtRoad
Try removing power from the PLM and the ISY, then power up the PLM, wait about 15 seconds then power up the ISY
If your able to access the ISY via the admin console on your LAN then the router is not the issue.
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Techman's post in Need Help, Just updated Firmware on my ISY 994i Zw Pro from 4.9.0 to 5.3.4 and programs don't run. was marked as the answerAfter the upgrade did you delete your java cache, including applications and then download the ISY Launcher. The correct link is below.
https://isy.universal-devices.com/start.jnlp