WebUI became unresponsive after disconnecting Remote Cluster Controller (powered node off)

I powered a remote cluster controller, and right after I did the WebUI became unresponsive, meaning, I was no longer able to load the webui.

This is maybe relateD:

ERROR 2014-09-30 16:58:10,892 maasserver ################################ Exception: Unable to connect to cluster bc111c4d-5417-4d94-b548-7833b928678d; no connections available. ################################
ERROR 2014-09-30 16:58:10,907 maasserver Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 112, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/decorators/vary.py", line 19, in inner_func
    response = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston/resource.py", line 167, in __call__
    result = self.error_handler(e, request, meth, em_format)
  File "/usr/lib/python2.7/dist-packages/piston/resource.py", line 165, in __call__
    result = meth(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/api/support.py", line 189, in dispatch
    return function(self, request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/api/node_groups.py", line 183, in register
    nodegroup = register_nodegroup(request, uuid)
  File "/usr/lib/python2.7/dist-packages/maasserver/api/node_groups.py", line 107, in register_nodegroup
    cluster = form.save()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1589, in save
    nodegroup = super(NodeGroupDefineForm, self).save()
  File "/usr/lib/python2.7/dist-packages/django/forms/models.py", line 446, in save
    construct=False)
  File "/usr/lib/python2.7/dist-packages/django/forms/models.py", line 99, in save_instance
    instance.save()
  File "/usr/lib/python2.7/dist-packages/maasserver/models/nodegroup.py", line 216, in save
    return super(NodeGroup, self).save(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/models/timestampedmodel.py", line 55, in save
    return super(TimestampedModel, self).save(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/db/models/base.py", line 545, in save
    force_update=force_update, update_fields=update_fields)
  File "/usr/lib/python2.7/dist-packages/django/db/models/base.py", line 582, in save_base
    update_fields=update_fields, raw=raw, using=using)
  File "/usr/lib/python2.7/dist-packages/django/dispatch/dispatcher.py", line 185, in send
    response = receiver(signal=self, sender=sender, **named)
  File "/usr/lib/python2.7/dist-packages/maasserver/signals.py", line 87, in post_save_callback
    callback(instance, original_values, deleted=False)
  File "/usr/lib/python2.7/dist-packages/maasserver/dhcp_connect.py", line 69, in dhcp_post_edit_name_NodeGroup
    configure_dhcp(instance)
  File "/usr/lib/python2.7/dist-packages/maasserver/dhcp.py", line 159, in configure_dhcp
    configure_dhcpv4(nodegroup, ipv4_interfaces, ntp_server)
  File "/usr/lib/python2.7/dist-packages/maasserver/dhcp.py", line 124, in configure_dhcpv4
    return do_configure_dhcp(4, nodegroup, interfaces, ntp_server)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/utils/twisted.py", line 143, in wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/dhcp.py", line 111, in do_configure_dhcp
    client = getClientFor(nodegroup.uuid)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/utils/twisted.py", line 106, in wrapper
    return func_in_reactor(*args, **kwargs).wait()
  File "/usr/lib/python2.7/dist-packages/crochet/_eventloop.py", line 219, in wait
    result.raiseException()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 577, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/maasserver/rpc/regionservice.py", line 517, in cancelled
    uuid)
NoConnectionsAvailable: Unable to connect to cluster bc111c4d-5417-4d94-b548-7833b928678d; no connections available.