I have 4 1510 52X. At first, in test-environment all was good, 4 units in stack. We have upgraded all units with latest firmware.
Now, we have put two on them into production - works. The rest, just blinks on all ports and refuses to stack with the two that is working.
Any idea on what to try? Traffic is flowing (shows green on stacking port and log says interface up - but GUI does not show that and does not show the dropdown for unit 3 and 4). Also, all ligths are blinking, specially if we boot them up while the stacking-cables are in place.
Unit ID is uniqe for all units (1, 2, 3 and 4), with same 1, 2, 3, 4 priority.
We have reset the units (including IP and all) - the two units in test-environment can stack nicely together, but fails as soon as one of them tries to stack with the two in production. The logs doesn't say anything other than ports up.
What do test next? I'm out of ideas. I have even tried the cables that work between the units that work, against the working ones and same result.
Can it be a bug in the firmware? We are running the latest official one.
