Duet Memory on NX Controllers
Several recent projects leveraging duet modules on NX controllers have found java router lockups after varying amounts of runtime. A simple first step in remediation is to up your duet memory to 128mb (default was 64mb). For sites we were tracking, this one change resolved the majority of issues. It appears that some sites would run right up against the 64mb limit and then if it crossed the line, you were toast. Moving the line by increasing the allocated memory seems to have helped in those surge instances and avoid catastrophic lockups.
Certainly not a silver bullet for all processor lock-ups, but something to try if you find yourself in a frustrating situation you cannot explain with a NX + duet combo.
STEPS TO CHANGE
telnet or ssh into controller
set duet memory