Encountered a strange issue where our HP M401dn was working fine on the local subnet, could ping and print to the device, no issue. But despite having the correct gateway and subnet, connectivity from across the WAN was intermittent. Was able to confirm by doing an continuous ping from across the WAN to the IP of the printer. Connection would flap, in and out, while local connection was rock solid.
Found this HP Support thread with others experiencing the same issue:
http://h30499.www3.hp.com/t5/Print-Servers-Network-Storage/Unable-to-ping-Printer-from-a-different-subnet/m-p/6219017/highlight/false#M28064
Firmware on the HP 401dn is Firmware Datecode: 20120221. Going to see if there is an update for this device of if the HP Support channel has any suggestions.
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