Comment 1 for bug 1673916

Thanks for the bug report. The traceback is helpful, but doesn't make the root cause obvious. What happens if you do the following on the rack controller where this occurred?

    maas-rack observe-mdns

It *should* print out a list of JSON objects, one per line, such as:

    {"hostname": "fearsome-fawn", "interface": "eth0", "address": "192.168.122.5"}

If it does anything other than that, let's take a step back and see what happens if you run:

    /usr/bin/avahi-browse --all --resolve --no-db-lookup --parsable --no-fail

Thanks in advance.