diff --git a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/GetGroupNamesAction.java b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/GetGroupNamesAction.java
new file mode 100644
index 0000000000000000000000000000000000000000..40a0d780938c326ff18fb3df7478ea264e9e75ac
--- /dev/null
+++ b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/GetGroupNamesAction.java
@@ -0,0 +1,101 @@
+/*
+ ************************************************************************
+ *******************  CANADIAN ASTRONOMY DATA CENTRE  *******************
+ **************  CENTRE CANADIEN DE DONNÉES ASTRONOMIQUES  **************
+ *
+ *  (c) 2014.                            (c) 2014.
+ *  Government of Canada                 Gouvernement du Canada
+ *  National Research Council            Conseil national de recherches
+ *  Ottawa, Canada, K1A 0R6              Ottawa, Canada, K1A 0R6
+ *  All rights reserved                  Tous droits réservés
+ *
+ *  NRC disclaims any warranties,        Le CNRC dénie toute garantie
+ *  expressed, implied, or               énoncée, implicite ou légale,
+ *  statutory, of any kind with          de quelque nature que ce
+ *  respect to the software,             soit, concernant le logiciel,
+ *  including without limitation         y compris sans restriction
+ *  any warranty of merchantability      toute garantie de valeur
+ *  or fitness for a particular          marchande ou de pertinence
+ *  purpose. NRC shall not be            pour un usage particulier.
+ *  liable in any event for any          Le CNRC ne pourra en aucun cas
+ *  damages, whether direct or           être tenu responsable de tout
+ *  indirect, special or general,        dommage, direct ou indirect,
+ *  consequential or incidental,         particulier ou général,
+ *  arising from the use of the          accessoire ou fortuit, résultant
+ *  software.  Neither the name          de l'utilisation du logiciel. Ni
+ *  of the National Research             le nom du Conseil National de
+ *  Council of Canada nor the            Recherches du Canada ni les noms
+ *  names of its contributors may        de ses  participants ne peuvent
+ *  be used to endorse or promote        être utilisés pour approuver ou
+ *  products derived from this           promouvoir les produits dérivés
+ *  software without specific prior      de ce logiciel sans autorisation
+ *  written permission.                  préalable et particulière
+ *                                       par écrit.
+ *
+ *  This file is part of the             Ce fichier fait partie du projet
+ *  OpenCADC project.                    OpenCADC.
+ *
+ *  OpenCADC is free software:           OpenCADC est un logiciel libre ;
+ *  you can redistribute it and/or       vous pouvez le redistribuer ou le
+ *  modify it under the terms of         modifier suivant les termes de
+ *  the GNU Affero General Public        la “GNU Affero General Public
+ *  License as published by the          License” telle que publiée
+ *  Free Software Foundation,            par la Free Software Foundation
+ *  either version 3 of the              : soit la version 3 de cette
+ *  License, or (at your option)         licence, soit (à votre gré)
+ *  any later version.                   toute version ultérieure.
+ *
+ *  OpenCADC is distributed in the       OpenCADC est distribué
+ *  hope that it will be useful,         dans l’espoir qu’il vous
+ *  but WITHOUT ANY WARRANTY;            sera utile, mais SANS AUCUNE
+ *  without even the implied             GARANTIE : sans même la garantie
+ *  warranty of MERCHANTABILITY          implicite de COMMERCIALISABILITÉ
+ *  or FITNESS FOR A PARTICULAR          ni d’ADÉQUATION À UN OBJECTIF
+ *  PURPOSE.  See the GNU Affero         PARTICULIER. Consultez la Licence
+ *  General Public License for           Générale Publique GNU Affero
+ *  more details.                        pour plus de détails.
+ *
+ *  You should have received             Vous devriez avoir reçu une
+ *  a copy of the GNU Affero             copie de la Licence Générale
+ *  General Public License along         Publique GNU Affero avec
+ *  with OpenCADC.  If not, see          OpenCADC ; si ce n’est
+ *  <http://www.gnu.org/licenses/>.      pas le cas, consultez :
+ *                                       <http://www.gnu.org/licenses/>.
+ *
+ *  $Revision: 4 $
+ *
+ ************************************************************************
+ */package ca.nrc.cadc.ac.server.web;
+
+import java.util.Collection;
+
+import ca.nrc.cadc.ac.server.GroupPersistence;
+
+import com.csvreader.CsvWriter;
+
+public class GetGroupNamesAction extends GroupsAction
+{
+
+    GetGroupNamesAction(GroupLogInfo logInfo)
+    {
+        super(logInfo);
+    }
+
+    public Object run()
+        throws Exception
+    {
+        GroupPersistence groupPersistence = getGroupPersistence();
+        Collection<String> groups = groupPersistence.getGroupNames();
+        response.setContentType("text/csv");
+        
+        CsvWriter writer = new CsvWriter(response.getWriter(), ',');
+        
+        for (String group : groups)
+        {
+            writer.write(group);
+        }
+        writer.endRecord();
+        return null;
+    }
+
+}
diff --git a/projects/cadcAccessControl/test/src/ca/nrc/cadc/ac/client/GMSClientTest.java b/projects/cadcAccessControl/test/src/ca/nrc/cadc/ac/client/GMSClientTest.java
index 9b7ff193ade683d269a2b912121b4af987d8d70a..3025fb37678ac4fc3d0f464e6b320f9ced4ebcaf 100644
--- a/projects/cadcAccessControl/test/src/ca/nrc/cadc/ac/client/GMSClientTest.java
+++ b/projects/cadcAccessControl/test/src/ca/nrc/cadc/ac/client/GMSClientTest.java
@@ -140,20 +140,21 @@ public class GMSClientTest
         try
         {
             Subject subject = new Subject();
-            final HttpPrincipal userID = new HttpPrincipal("test");
-            subject.getPrincipals().add(userID);
+            final HttpPrincipal test1UserID = new HttpPrincipal("test");
+            subject.getPrincipals().add(test1UserID);
+            
+            RegistryClient regClient = new RegistryClient();
+            URL baseURL = regClient.getServiceURL(new URI(AC.GMS_SERVICE_URI),
+                    "https");
+            final GMSClient client = new GMSClient(baseURL.toString());
 
             Subject.doAs(subject, new PrivilegedExceptionAction<Object>()
                 {
                     @Override
                     public Object run() throws Exception
                     {
-                        RegistryClient regClient = new RegistryClient();
-                        URL baseURL = regClient.getServiceURL(new URI(AC.GMS_SERVICE_URI),
-                                                              "https");
-                        GMSClient client = new GMSClient(baseURL.toString());
 
-                        List<Group> initial = client.getCachedGroups(userID, Role.MEMBER);
+                        List<Group> initial = client.getCachedGroups(test1UserID, Role.MEMBER);
                         Assert.assertNull("Cache should be null", initial);
 
                         List<Group> expected = new ArrayList<Group>();
@@ -162,31 +163,65 @@ public class GMSClientTest
                         expected.add(group1);
                         expected.add(group2);
 
-                        client.setCachedGroups(userID, expected, Role.MEMBER);
+                        client.setCachedGroups(test1UserID, expected, Role.MEMBER);
 
-                        List<Group> actual = client.getCachedGroups(userID, Role.MEMBER);
+                        List<Group> actual = client.getCachedGroups(test1UserID, Role.MEMBER);
                         Assert.assertEquals("Wrong cached groups", expected, actual);
                         
                         // check against another role
-                        actual = client.getCachedGroups(userID, Role.OWNER);
+                        actual = client.getCachedGroups(test1UserID, Role.OWNER);
                         Assert.assertNull("Cache should be null", actual);
                         
                         // check against another userid
-                        final HttpPrincipal userID2 = new HttpPrincipal("test2");
-                        actual = client.getCachedGroups(userID2, Role.MEMBER);
+                        final HttpPrincipal anotherUserID = new HttpPrincipal("anotheruser");
+                        actual = client.getCachedGroups(anotherUserID, Role.MEMBER);
                         Assert.assertNull("Cache should be null", actual);
 
                         return null;
                     }
                 });
+            
+            subject = new Subject();
+            final HttpPrincipal test2UserID = new HttpPrincipal("test2");
+            subject.getPrincipals().add(test2UserID);
+            
+            // do the same but as a different user
+            Subject.doAs(subject, new PrivilegedExceptionAction<Object>()
+                    {
+                        @Override
+                        public Object run() throws Exception
+                        {
+
+                            List<Group> initial = client.getCachedGroups(test2UserID, Role.MEMBER);
+                            Assert.assertNull("Cache should be null", initial);
+
+                            List<Group> expected = new ArrayList<Group>();
+                            Group group1 = new Group("1");
+                            Group group2 = new Group("2");
+                            expected.add(group1);
+                            expected.add(group2);
+
+                            client.setCachedGroups(test2UserID, expected, Role.MEMBER);
+
+                            List<Group> actual = client.getCachedGroups(test2UserID, Role.MEMBER);
+                            Assert.assertEquals("Wrong cached groups", expected, actual);
+                            
+                            // check against another role
+                            actual = client.getCachedGroups(test2UserID, Role.OWNER);
+                            Assert.assertNull("Cache should be null", actual);
+                            
+                            // check against another userid
+                            final HttpPrincipal anotherUserID = new HttpPrincipal("anotheruser");
+                            actual = client.getCachedGroups(anotherUserID, Role.MEMBER);
+                            Assert.assertNull("Cache should be null", actual);
+
+                            return null;
+                        }
+                    });
 
             // do the same without a subject
-            RegistryClient regClient = new RegistryClient();
-            URL baseURL = regClient.getServiceURL(new URI(AC.GMS_SERVICE_URI),
-                                                  "https");
-            GMSClient client = new GMSClient(baseURL.toString());
 
-            List<Group> initial = client.getCachedGroups(userID, Role.MEMBER);
+            List<Group> initial = client.getCachedGroups(test1UserID, Role.MEMBER);
             Assert.assertNull("Cache should be null", initial);
 
             List<Group> newgroups = new ArrayList<Group>();
@@ -195,9 +230,9 @@ public class GMSClientTest
             newgroups.add(group1);
             newgroups.add(group2);
 
-            client.setCachedGroups(userID, newgroups, Role.MEMBER);
+            client.setCachedGroups(test1UserID, newgroups, Role.MEMBER);
 
-            List<Group> actual = client.getCachedGroups(userID, Role.MEMBER);
+            List<Group> actual = client.getCachedGroups(test1UserID, Role.MEMBER);
             Assert.assertNull("Cache should still be null", actual);
         }
         catch (Throwable t)