Another day, another NPrinting issue, sigh...
We are using the July 2017 engine. NPrinting reports quietly stopped working six days ago, with days worth of report tasks being queued up - over 100.
Upon investigation, I found that the single NPrinting engine was offline. I find the following error messages in the nprinting_scheduler.log file:
Receiving allocation from unknown engine 16ffadc1-5450-4ae4-b478-85c21d8eb6e0. Message will be discarded.
How to fix this?