The bluetooth_SDP tests are mostly failing with "Unhandled Fault: <Fault 1: "<class 'autotest_lib.client.common_lib.cros.bluetooth.bluetooth_sdp_socket.BluetoothSDPSocketError'>:Error connecting to host: [Errno 112] Host is down">" error

sample log:

09/10 14:04:16.851 ERROR|             utils:0287| [stderr] cat: /usr/local/autotest/.checksum: No such file or directory
09/10 14:04:21.267 WARNI|             retry:0228| <class 'socket.error'>([Errno 111] Connection refused)
09/10 14:04:21.268 WARNI|             retry:0183| Retrying in 1.144031 seconds...
09/10 14:04:55.661 WARNI|          autotest:0241| No job_repo_url for <remote host: chromeos15-row1-rack8-host1-router>
09/10 14:05:11.392 WARNI|             retry:0228| <class 'socket.error'>([Errno 111] Connection refused)
09/10 14:05:11.392 WARNI|             retry:0183| Retrying in 0.530981 seconds...
09/10 14:05:11.943 WARNI|             retry:0228| <class 'httplib.BadStatusLine'>('')
09/10 14:05:11.944 WARNI|             retry:0183| Retrying in 1.494566 seconds...
09/10 14:05:39.491 WARNI|              test:0606| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 806, in _call_test_function
    raise error.UnhandledTestFail(e)
UnhandledTestFail: Unhandled Fault: <Fault 1: "<class 'autotest_lib.client.common_lib.cros.bluetooth.bluetooth_sdp_socket.BluetoothSDPSocketError'>:Error connecting to host: [Errno 112] Host is down">
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 800, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 464, in execute
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 371, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/server/site_tests/bluetooth_SDP_ServiceAttributeRequest/bluetooth_SDP_ServiceAttributeRequest.py", line 441, in run_once
    self.correct_request()
  File "/usr/local/autotest/server/site_tests/bluetooth_SDP_ServiceAttributeRequest/bluetooth_SDP_ServiceAttributeRequest.py", line 367, in correct_request
    self.tester.connect(self.adapter['Address'])
  File "/usr/local/autotest/server/cros/bluetooth/bluetooth_tester.py", line 146, in connect
    self._proxy.connect(address)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1233, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1587, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.7/xmlrpclib.py", line 1273, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1306, in single_request
    return self.parse_response(response)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1482, in parse_response
    return u.close()
  File "/usr/lib/python2.7/xmlrpclib.py", line 794, in close
    raise Fault(**self._stack[0])
Fault: <Fault 1: "<class 'autotest_lib.client.common_lib.cros.bluetooth.bluetooth_sdp_socket.BluetoothSDPSocketError'>:Error connecting to host: [Errno 112] Host is down">