download() in util.py got "Connection refused" from some server

Linaro image server has no such failure, but I saw it on my own server, and I think it may affect some server too.

Printing traceback will see the "Connection refused" error:
root@master:/tmp#tar czf /tmp/lava_results.tgz -C /tmp//lava/results .
 tar czf /tmp/lava_results.tgz -C /tmp//lava/results .
root@master:/tmifconfig eth0 | grep 'inet addr' | awk -F: '{print $2}' |awk '{print $1}'
{print $1}' eth0 | grep 'inet addr' | awk -F: '{print $2}' |awk '
192.168.12.2
root@master:/tmp#
id=0
python -m SimpleHTTPServer 80 &> /dev/null &
Traceback (most recent call last):
  File "/home/spring/linaro/lava/91_merged/reliable-result-transfer/lava_dispatcher/utils.py", line 35, in download
    response = urllib2.urlopen(urllib2.quote(url, safe=":/"), timeout=5)
  File "/usr/lib/python2.6/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.6/urllib2.py", line 391, in open
    response = self._open(req, data)
  File "/usr/lib/python2.6/urllib2.py", line 409, in _open
    '_open', req)
  File "/usr/lib/python2.6/urllib2.py", line 369, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.6/urllib2.py", line 1161, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "/usr/lib/python2.6/urllib2.py", line 1136, in do_open
    raise URLError(err)
URLError: <urlopen error [Errno 111] Connection refused>
Traceback (most recent call last):
  File "./lava-dispatch", line 42, in <module>
    job.run()
  File "/home/spring/linaro/lava/91_merged/reliable-result-transfer/lava_dispatcher/__init__.py", line 103, in run
    action.run(**params)
  File "/home/spring/linaro/lava/91_merged/reliable-result-transfer/lava_dispatcher/actions/launch_control.py", line 108, in run
    result_path = download(result_tarball, tarball_dir)
  File "/home/spring/linaro/lava/91_merged/reliable-result-transfer/lava_dispatcher/utils.py", line 42, in download
    raise RuntimeError("Could not retrieve %s" % url)
RuntimeError: Could not retrieve http://192.168.12.2/lava_results.tgz