Click on the link at the first of my first post and install that firmware by following the directions supplied.
If you won't install the firmware I provided in that link then you will need to call Xerox and provide them with a Configuration report from the printer, and a Wireshark trace of the failed scan, and possibly the machine logs and they will look into the network traffic and find exactly what has caused the fault.
And the fix will be a firmware update, and since the spar links doesn't change, the fix will be available at the link I provided in the first response, which is not the link the printer looks to when it checks for an update.