History export download multiple ConnectionResetError and proxyError

[Colorstorm]

Hi everyone,

I'm trying to export and download (for backup reasons) multiple histories.
With some histories I get an ConnectionRestError and proxyError(see below), other histories just work fine.

My code:

from bioblend.galaxy import GalaxyInstance

ip = '172.XXX.XXX.XXX.XXX'
api_key = 'XXXXXXXX'

gi = GalaxyInstance(url=ip, key=api_key)
histories_list = gi.histories.get_histories(deleted=False)
for history in histories_list:
    jeha_id = gi.histories.export_history(history['id'], gzip=True, include_hidden=False, include_deleted=False,
                                          wait=True, maxwait=None)
    f = open("test/" + history['id'] + '.tar.gz', 'wb')
    gi.histories.download_history(history_id=history['id'], jeha_id=jeha_id, outf=f)
    f.close()

The exception

Traceback (most recent call last):
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/urllib3/connectionpool.py", line 672, in urlopen
    chunked=chunked,
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/urllib3/connectionpool.py", line 421, in _make_request
    six.raise_from(e, None)
  File "<string>", line 3, in raise_from
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/urllib3/connectionpool.py", line 416, in _make_request
    httplib_response = conn.getresponse()
  File "/usr/lib/python3.5/http/client.py", line 1213, in getresponse
    response.begin()
  File "/usr/lib/python3.5/http/client.py", line 307, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python3.5/http/client.py", line 268, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/usr/lib/python3.5/socket.py", line 575, in readinto
    return self._sock.recv_into(b)
ConnectionResetError: [Errno 104] Connection reset by peer

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/requests/adapters.py", line 449, in send
    timeout=timeout
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/urllib3/connectionpool.py", line 720, in urlopen
    method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/urllib3/util/retry.py", line 436, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='XXXXXX', port=XXXX): Max retries exceeded with url: http://XXXipXXX/api/histories/XXXXhistoryIDXXX/exports?key=XXXXXX (Caused by ProxyError('Cannot connect to proxy.', ConnectionResetError(104, 'Connection reset by peer')))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/pythonProjects/bioblend/exportBugTest.py", line 10, in <module>
    wait=True, maxwait=None)
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/bioblend/galaxy/histories/__init__.py", line 617, in export_history
    r = self._put(payload={}, url=url, params=params)
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/bioblend/galaxy/client.py", line 165, in _put
    return self.gi.make_put_request(url, payload=payload, params=params)
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/bioblend/galaxyclient.py", line 205, in make_put_request
    verify=self.verify, timeout=self.timeout)
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/requests/api.py", line 131, in put
    return request('put', url, data=data, **kwargs)
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/pythonProjects/bioblend/venv/lib/python3.5/site-packages/requests/adapters.py", line 510, in send
    raise ProxyError(e, request=request)
requests.exceptions.ProxyError: HTTPConnectionPool(host='XXXX' port=XXXX): Max retries exceeded with url: http://XXXipXXX/api/histories/XXXXhistoryIDXXX/exports?key=XXXXXX(Caused by ProxyError('Cannot connect to proxy.', ConnectionResetError(104, 'Connection reset by peer')))

I hope that anyone has an idea how to fix these.
Thanks a lot in advance and best regards
Fabian