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LAN problems? Group of UM3 acting "weird"

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Posted · LAN problems? Group of UM3 acting "weird"

I don't expect a solution but I figured I would lay out what I have happening and see if anyone has suggestions.


I manage a makerspace at a university and we have a workgroup of 4 UM3 connected through LAN, each with their own dedicated IP address. I have managed this group for about 5 years with only an occasional issue, until this week.


The group of 4 UM3, initially they were on a mix of older firmware but with the issues, I updated them all to the latest "maintenance" firmware to rule out any incompatibility problems.

I first noticed an issue when a printer was labeled as "Unreachable" in Cura 4.13.1 under the monitor tab. I restarted the printer and it would initially boot, show the Ultimaker logo, and then just a black screen and green ring around the controller circle. I let it sit for an hour but nothing. Eventually after a lot of experimenting, I realized that if I unplugged the LAN cable, the printer would start up as normal. I then plugged the LAN cable back in and it showed up in Cura, but...later it was unreachable again.


That is when I thought maybe it was the differing firmware so I updated them all to 5.3.0.


After the updates, they still wont boot with the LAN cables plugged in but I can unplug the LAN, boot them and plug them back in. Now they are all unreachable in CURA BUT I can still click on the camera and get a live video from each printer so the network must be working somewhat?!?!  If I click on Manage Printer button in Cura, it launches a web browser and then I choose "Print Jobs" tab in Ultimaker Digital Factory, they all show "This printer currently can't be reached" but once in a while, one will connect and then disconnect again almost immediately.


My next step is to maybe take them home or somewhere where I can put them on another network to see if it's a network issue or a printer group but I really don't want to go through that amount of troubleshooting if someone had a better idea. I plugged my laptop into the LAN cable and my computer got out into the network without an issue so I don't think it's that. I was also thinking of trying to use the WIFI grouping but setting up that in the University is a bit of an issue since me have to register each device and I don't think I could keep a specific IP address for each printer or at least the amount of work it would entail seems greater than figuring out why the LAN that was rock solid for 5 years now won't work.

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    Posted · LAN problems? Group of UM3 acting "weird"

    I have been troubleshooting this issue more this morning and decided to reset the printers to factory settings and try using just a WiFi connection. The printer was stable and able to be seen by Cura all morning. I then connected the LAN cable and tried switching the connection and the printer was immediately lost. Kind of running out of ideas except to bring a few printers home and see if they behave similarly on another network.

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