Lutron RA2 Can't detect device & missing port

My long functioning Lutron RA2 (telnet) plugin broken.

After rebooting Lutron and VeraPlus, the Lutron RA2 plugin reports “Can’t detect device”. When I try to make a change on a Lutron device, the plugin thereafter reports “Missing port”, forever-until reboot.

The Lutron system still functions fine by itself, and ordinary telnet traffic can be seen using putty.

Any suggestion for where to look? Thank you.

Found it: it was an incorrect value in a Pico componetNumber field.

Pretty dramatic that would take down the entire RA2 interface.

Also, the RA2 plug in works with Lutron 12.1