diff --git a/news/59.bugfix b/news/59.bugfix
new file mode 100644
index 0000000..59f688a
--- /dev/null
+++ b/news/59.bugfix
@@ -0,0 +1 @@
+Fixed test for 'Connection refused' which could be 'Connection reset'.  [maurits]
diff --git a/setup.py b/setup.py
index 9fd0f00..cde47b9 100644
--- a/setup.py
+++ b/setup.py
@@ -5,6 +5,7 @@
 import os
 import os.path
 
+
 version = '7.0.1.dev0'
 
 install_requires = [
@@ -46,8 +47,8 @@
     long_description=(u'\n\n'.join([
         open(os.path.join("src", "plone", "testing", "README.rst")).read(),
         open("CHANGES.rst").read(),
-        "Detailed documentation\n" +
-        "======================",
+        "Detailed documentation\n"
+        + "======================",
         open(os.path.join("src", "plone", "testing", "layer.rst")).read(),
         open(os.path.join("src", "plone", "testing", "zca.rst")).read(),
         open(os.path.join("src", "plone", "testing", "security.rst")).read(),
diff --git a/src/plone/testing/layer.py b/src/plone/testing/layer.py
index a95b8c6..90dc791 100644
--- a/src/plone/testing/layer.py
+++ b/src/plone/testing/layer.py
@@ -123,9 +123,9 @@ def _mergeResourceManagers(self, seqs):
 
     def _resourceResolutionOrder(self, instance):
         return self._mergeResourceManagers(
-            [[instance]] +
-            list(map(self._resourceResolutionOrder, instance.__bases__)) +
-            [list(instance.__bases__)]
+            [[instance]]
+            + list(map(self._resourceResolutionOrder, instance.__bases__))
+            + [list(instance.__bases__)]
         )
 
 
diff --git a/src/plone/testing/zope.rst b/src/plone/testing/zope.rst
index 61cdb79..9c351de 100644
--- a/src/plone/testing/zope.rst
+++ b/src/plone/testing/zope.rst
@@ -523,7 +523,14 @@ When the server is torn down, the WSGIServer thread is stopped.::
     Tear down plone.testing.zope.Startup in ... seconds.
     Tear down plone.testing.zca.LayerCleanup in ... seconds.
 
-    >>> conn = urlopen(app_url + '/folder1', timeout=5)
-    Traceback (most recent call last):
-    ...
-    URLError: <urlopen error [Errno ...] Connection refused>
+We can expect one of these exceptions:
+- URLError: <urlopen error [Errno ...] Connection refused>
+- error: [Errno 104] Connection reset by peer
+
+    >>> try:
+    ...     conn = urlopen(app_url + '/folder1', timeout=5)
+    ... except Exception as exc:
+    ...     if 'Connection refused' not in str(exc) and 'Connection reset' not in str(exc):
+    ...         raise exc
+    ... else:
+    ...     print('urlopen should have raised exception')
diff --git a/src/plone/testing/zserver.rst b/src/plone/testing/zserver.rst
index df94d1c..d7ec4f4 100644
--- a/src/plone/testing/zserver.rst
+++ b/src/plone/testing/zserver.rst
@@ -526,10 +526,18 @@ When the server is torn down, the ZServer thread is stopped.::
     Tear down plone.testing.zserver.Startup in ... seconds.
     Tear down plone.testing.zca.LayerCleanup in ... seconds.
 
-    >>> conn = urllib2.urlopen(app_url + '/folder1', timeout=5)
-    Traceback (most recent call last):
-    ...
-    URLError: <urlopen error [Errno ...] Connection refused>
+We can expect one of these exceptions:
+- URLError: <urlopen error [Errno ...] Connection refused>
+- error: [Errno 104] Connection reset by peer
+
+    >>> try:
+    ...     conn = urllib2.urlopen(app_url + '/folder1', timeout=5)
+    ... except Exception as exc:
+    ...     if 'Connection refused' not in str(exc) and 'Connection reset' not in str(exc):
+    ...         raise exc
+    ... else:
+    ...     print('urllib2.urlopen should have raised exception')
+
 
 FTP server
 ~~~~~~~~~~
diff --git a/tox.ini b/tox.ini
index 4cf753d..7447371 100644
--- a/tox.ini
+++ b/tox.ini
@@ -62,8 +62,8 @@ deps =
     flake8-debugger
     flake8-deprecated
     flake8-print
-    flake8-pytest
-    flake8-todo
+    # flake8-pytest
+    # flake8-todo
     flake8-isort
     mccabe
     # Potential flake8 plugins that should be used:  # TBD
@@ -81,7 +81,7 @@ deps =
 commands =
     mkdir -p {toxinidir}/_build/reports/flake8
     - flake8 --format=html --htmldir={toxinidir}/_build/reports/flake8 --doctests src setup.py
-    flake8 --doctests src tests setup.py
+    flake8 --doctests --ignore=W503 src tests setup.py
     isort --check-only --recursive {toxinidir}/src
 
 whitelist_externals =