This appears to be back to an old issue…
when powering the Powerbox via 24vdc jack I can power other devices using POE out on ports 2-5
when powering the Powerbox via poe in on ether1 I can not power other devices on ports 2-5 it gets cable short.
I have set Long cable in the settings, but does not help.
ROs is 6.29.1 and POE firmware is 2.1 (POE firmware is not upgradeable anymore like before.)
I have 2 new units that are behaving the same way, so I do not believe it is a defective device.
Thats odd, I have many Powerbox’s & they give 10 times less issues than the RB260GSP with the cable short nonsense (yes, even on 1.17).
Anyway, are you sure that you are using the correct power supply that came with the Powerbox (the 2.2A or 2.5A one)?
What happens if you set the poe-mode=force , does it power the devices then?
No forced will not work… and I have many others in use too
Hello,
Today I experienced the same problem. I found this topic and tried 24V jack and it is working. But I need poe in 
Did anyone found solution? Firmware is 3.36, software 6.38.3 and poe version 2.17. Interesting is that Ubnt devices are working ok, but groove, basebox, metal is not working…
Try in terminal:
/interface ethernet poe settings set ether1-poe-in-long-cable=yes
Yes, that worked. Sadly, ubiquity devices don’t need that, but mikrotik devices need it.
I seem to be having the same issue. I have it fed with power via POE, powering my Ubiquiti AP’s (just a 900 loco and a 2.4 loco). On my AirControl server, im seeing them powercycle. The Powerbox is fed from my backbone, and im seeing that port go up and down. (backbone is 2 RB450G’s). If the long cable setting doesnt work, have anything else I can try?
I tried /interface ethernet poe settings set ether1-poe-in-long-cable=yes and it still cuts out spuratically
Check the Voltage coming to Powerbox, it will operate in wide range 6-30V; however, some UBNT devices do not like power below 22V. They do not power off but the LAN connection gets finicky. If you go over 23 all should be good
I ended up lowering the MTU levels and it resolved.