Comment 3 for bug 1524482

Still happening on 1.10.0~alpha1+bzr4545-0ubuntu1~xenial2. From http://paste.ubuntu.com/13891333/:

2015-12-10 09:40:55 [HTTPChannel,27,127.0.0.1] 500 Error - /MAAS/clusters/9fcabc2e-cdfa-4b89-a4b2-36bf1fa44bc5/interfaces/ens9/edit/
        Traceback (most recent call last):
          File "/usr/lib/python3/dist-packages/provisioningserver/twisted/web/wsgi.py", line 459, in run
            appIterator = self.application(self.environ, self.startResponse)
          File "/usr/lib/python3/dist-packages/django/core/handlers/wsgi.py", line 189, in __call__
            response = self.get_response(request)
          File "/usr/lib/python3/dist-packages/maasserver/utils/views.py", line 227, in get_response
            response = get_response(request)
          File "/usr/lib/python3/dist-packages/maasserver/utils/views.py", line 216, in get_response
            request, get_resolver(None), sys.exc_info())
        --- <exception caught here> ---
          File "/usr/lib/python3/dist-packages/maasserver/utils/views.py", line 201, in get_response
            return django_get_response(request)
          File "/usr/lib/python3/dist-packages/maasserver/utils/orm.py", line 369, in __exit__
            self.fire()
          File "/usr/lib/python3/dist-packages/provisioningserver/utils/twisted.py", line 197, in wrapper
            return func(*args, **kwargs)
          File "/usr/lib/python3/dist-packages/maasserver/utils/async.py", line 195, in fire
            self._fire_in_reactor(hook).wait(LONGTIME)
          File "/usr/lib/python3/dist-packages/crochet/_eventloop.py", line 231, in wait
            result.raiseException()
          File "/usr/lib/python3/dist-packages/twisted/python/failure.py", line 368, in raiseException
            raise self.value.with_traceback(self.tb)
        provisioningserver.twisted.protocols.amp.UnhandledCommand: (b'UNHANDLED', 'Unknown Error [xenial-maas-110-test:pid=29678:cmd=ConfigureDHCPv4:ask=9b]')

I am testing with 1.10.0~alpha1+bzr4548-0ubuntu1~xenial1 now.