FANUC DPRNT to FTP: ERROR E-0522 [-1]

I am using DPRNT to FTP on multiple FANUC controllers from different manufacturers. They are all fairly similar. I have one that is giving me this nebulous error "E-0522 [-1]” near the end of the DPRNT macro. It's a MAKINO with the Professional 5 controller. I have proved out the FTP settings. If they are wrong, I get an alarm at POPEN. When the settings are correct the macro gets all the way to the end and alarms at PCLOS with “PS2032 EMBEDDED ETHERNET/DATA SERVER ERROR”, the internal error state of the Embedded board being E-0522 [-1] which I can't find any explanation for.

Have you seen this error? Do you know how to get past it?