epson printer randomly printing invalid tftp operation when i plug a dlink DNR-322L into the network

Hi, I have an old Epson TM-T88IV network printer for my tills.
I'm installing a CCTV IP system and using a Dlink DNR-322L as the recording device.
When I plug the DNR-322L into the network, the epson print randomly prints

Invalid TFTP Operation
Exiting firmware updates

I've seen this issue on lots of forums going back 10 years or more. no solution provided by epson by the looks of it.
Anybody know if its possible to disable the TFTP broadcast on a DNr-322L ?
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total123Asked:
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Tomas ValentaConnect With a Mentor IT ManagerCommented:
Hello,
can you run Wireshark on your LAN and catch TFTP protocol ? In the packet trace we can find who is TFTP client. Multicast extension of TFTP protocol is the following: client ask by sending tftp multicast packet server for multicast connect.
I looks like your printer is sending multicast tftp requests and D-link is answering. But from packet trace we will be sure.
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total123Author Commented:
hi, I'll take a look when onsite tomorrow. thanks for the idea
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Tomas ValentaIT ManagerCommented:
or D-link broadcast TFTP updates
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total123Author Commented:
we used wireshark and from the results, we decided to factory reset the DNR-322L and this resolved the problem.
I had done a firmware upgrade when i took the DNR out the box. it seems this may have been the issue. I've done another firmware upgrade and all seems fine.

thanks for the pointer.
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