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Hi. I'm a Unix Administrator, mathematics enthusiast, and amateur philosopher. This is where I rant about that which upsets me, laugh about that which amuses me, and jabber about that which holds my interest most: Unix.
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Ubiquiti Controller: Devices listed as "Disconnected"

Posted 06-23-2018 at 10:03 AM by rocket357
Updated 06-23-2018 at 10:12 AM by rocket357

Had this problem after an ip change for my controller. I have an EdgeRouter Lite with 2 US-8's hanging off of eth1 and eth2, and for silly reasons I needed to move my controller laptop from one US-8 to the other. Once I did that, the US-8 it was previously attached to and the AP-AC-LR attached to the old US-8 showed up in "Disconnected" state in the controller software (eth1 and eth2 are not bridged, currently. If they were, it would have avoided this issue).

A cursory review of the interwebs didn't help much. People say the US-8 and AP-AC-LR will look up "unifi" and use that IP as the controller (perhaps on first boot, but not during a broken configuration situation such as mine). Rebooting the disconnected devices didn't help, nor did killing the mcad process on the devices.

Once I'd ssh'd to the devices, I noticed a "cfg" folder in root's home. Within that, a file named "mgmt".

The following got me back up and running:

cp cfg/mgmt cfg/mgmt.ORIG; # *always* ensure you have a good backup before editing files!
sed -e 's/$OLD_IP/$NEW_IP/g' cfg/mgmt > mgmt.NEW;
mv mgmt.NEW cfg/mgmt;
ps ww | grep mcad; # note the mcad pid
kill $MCAD_PID;

By the time you've switched back to the controller, it should at least be making progress towards re-establishing connectivity.
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