diff --git a/src/omero/install/config_parser.py b/src/omero/install/config_parser.py
index ba0716008..700fca779 100755
--- a/src/omero/install/config_parser.py
+++ b/src/omero/install/config_parser.py
@@ -343,7 +343,7 @@ def parse_module(self, module='omeroweb.settings'):
         from django.conf import settings
 
         for key, values in sorted(
-                iter(settings.CUSTOM_SETTINGS_MAPPINGS.items()),
+                iter(list(settings.CUSTOM_SETTINGS_MAPPINGS.items())),
                 key=lambda k: k):
 
             p = Property()
@@ -372,8 +372,8 @@ def headers(self):
                     additional_headers[section] = Header(section)
                 headers.setdefault(additional_headers[section], []).append(x)
 
-        for key in headers.keys():
-            headers[key].sort(lambda a, b: cmp(a.key, b.key))
+        for key in list(headers.keys()):
+            headers[key].sort(key=lambda x: x.key)
         return headers
 
     def print_defaults(self):
@@ -412,6 +412,8 @@ def print_rst(self):
                 properties += "%s\n" % underline(len(p.key))
                 for line in p.txt.split("\n"):
                     if line:
+                        if isbytes(line):
+                            line = bytes_to_native_str(line)
                         properties += "%s\n" % (line)
                     else:
                         properties += "\n"