diff --git a/letsencrypt/cli.py b/letsencrypt/cli.py
index 6f4facc3e..957ada7af 100644
--- a/letsencrypt/cli.py
+++ b/letsencrypt/cli.py
@@ -169,7 +169,7 @@ def _determine_account(args, config):
 
 
 def _init_le_client(args, config, authenticator, installer):
-    config.deterimine_user_agent(authenticator, installer)
+    config.determine_user_agent(authenticator, installer)
     if authenticator is not None:
         # if authenticator was given, then we will need account...
         acc, acme = _determine_account(args, config)
diff --git a/letsencrypt/configuration.py b/letsencrypt/configuration.py
index a3fd33d69..345cf75b4 100644
--- a/letsencrypt/configuration.py
+++ b/letsencrypt/configuration.py
@@ -11,6 +11,7 @@ from acme import challenges
 from letsencrypt import constants
 from letsencrypt import errors
 from letsencrypt import interfaces
+from letsencrypt import le_util
 
 
 class NamespaceConfig(object):
@@ -84,17 +85,19 @@ class NamespaceConfig(object):
             return challenges.HTTP01Response.PORT
 
     def determine_user_agent(self, authenticator, installer):
-        # The user agent string isn't knowable until the authenticator and
-        # installer have been chosen.
+        """
+        Set a user_agent string in the config based on the choice of plugins.
+        (this wasn't knowable at construction time)
+        """
 
-        if self.user_agent is None:
+        if self.namespace.user_agent is None:
             ua = "LetsEncryptPythonClient/{0} ({1}) Authenticator/{2} Installer/{3}"
             ua = ua.format(letsencrypt.__version__, le_util.get_os_info(),
                            authenticator.name if authenticator else "none",
                            installer.name if installer else "none")
-            self.user_agent=ua
+            self.namespace.user_agent = ua
         else:
-            assert isinstance(self.user_agent, str), "User Agent not a string?"
+            assert isinstance(self.namespace.user_agent, str), "User Agent not a string?"
 
 
 class RenewerConfiguration(object):
diff --git a/letsencrypt/le_util.py b/letsencrypt/le_util.py
index 4a780e36b..112c90a6e 100644
--- a/letsencrypt/le_util.py
+++ b/letsencrypt/le_util.py
@@ -224,8 +224,8 @@ def get_os_info():
         ).communicate()[0]
     elif os_type.startswith('freebsd'):
         # eg "9.3-RC3-p1"
-        os_ver = os_ver.parititon("-")[0]
-        os_ver = os_ver.parititon(".")[0]
+        os_ver = os_ver.partition("-")[0]
+        os_ver = os_ver.partition(".")[0]
     elif platform.win32_ver()[1]:
         os_ver = platform.win32_ver()[1]
     else:
diff --git a/letsencrypt/tests/client_test.py b/letsencrypt/tests/client_test.py
index 4a61194f3..3caea4f05 100644
--- a/letsencrypt/tests/client_test.py
+++ b/letsencrypt/tests/client_test.py
@@ -71,7 +71,7 @@ class ClientTest(unittest.TestCase):
 
     def test_init_acme_verify_ssl(self):
         self.acme_client.assert_called_once_with(
-            directory=mock.ANY, key=mock.ANY, verify_ssl=True)
+            directory=mock.ANY, key=mock.ANY, ua=mock.ANY, verify_ssl=True)
 
     def _mock_obtain_certificate(self):
         self.client.auth_handler = mock.MagicMock()