diff --git a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/UserPersistence.java b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/UserPersistence.java
index f6d1e2e69aa45730707c07933b994f1a805236cd..9ae4d37f108ca3f3eb7ed11d5ab966c8e3f4ddeb 100755
--- a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/UserPersistence.java
+++ b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/UserPersistence.java
@@ -68,14 +68,16 @@
  */
 package ca.nrc.cadc.ac.server;
 
+import java.security.AccessControlException;
+import java.security.Principal;
+import java.util.Collection;
+
 import ca.nrc.cadc.ac.User;
 import ca.nrc.cadc.ac.UserNotFoundException;
 import ca.nrc.cadc.ac.UserRequest;
 import ca.nrc.cadc.net.TransientException;
+
 import com.unboundid.ldap.sdk.DN;
-import java.security.AccessControlException;
-import java.security.Principal;
-import java.util.Collection;
 
 public abstract interface UserPersistence<T extends Principal>
 {
diff --git a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAO.java b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAO.java
index 5a58d0faa361410a4351f386deb75b8c3ed05a26..8ed1561cc7f07b97fb2869e405661bd0834f4c27 100755
--- a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAO.java
+++ b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAO.java
@@ -96,7 +96,6 @@ import java.util.Map;
 import javax.security.auth.x500.X500Principal;
 import org.apache.log4j.Logger;
 
-
 public class LdapUserDAO<T extends Principal> extends LdapDAO
 {
     private static final Logger logger = Logger.getLogger(LdapUserDAO.class);
@@ -160,6 +159,55 @@ public class LdapUserDAO<T extends Principal> extends LdapDAO
                          memberAttribs.length);
         memberAttribs = tmp;
     }
+    
+    /**
+     * 
+     * @return
+     * @throws TransientException 
+     */
+    public Collection<HttpPrincipal> getCadcIDs() throws TransientException
+    {
+        try
+        {
+            Filter filter = Filter.createPresenceFilter("uid");
+            String [] attributes = new String[] {"uid"};
+            
+            SearchRequest searchRequest = 
+                    new SearchRequest(config.getUsersDN(), 
+                                      SearchScope.SUB, filter, attributes);
+    
+            SearchResult searchResult = null;
+            try
+            {
+                searchResult = getConnection().search(searchRequest);
+            }
+            catch (LDAPSearchException e)
+            {
+                if (e.getResultCode() == ResultCode.NO_SUCH_OBJECT)
+                {
+                    logger.debug("Could not find users root", e);
+                    throw new IllegalStateException("Could not find users root");
+                }
+            }
+            
+            LdapDAO.checkLdapResult(searchResult.getResultCode());
+            Collection<HttpPrincipal> userIDs = new HashSet<HttpPrincipal>();
+            for (SearchResultEntry next : searchResult.getSearchEntries())
+            {
+                userIDs.add(new HttpPrincipal(next.getAttributeValue("uid")));
+            }
+            
+            return userIDs;
+        }
+        catch (LDAPException e1)
+        {
+            logger.debug("getCadcIDs Exception: " + e1, e1);
+            LdapDAO.checkLdapResult(e1.getResultCode());
+            throw new IllegalStateException("Unexpected exception: " + 
+                    e1.getMatchedDN(), e1);
+        }
+        
+    }
 
 
     /**
diff --git a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserPersistence.java b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserPersistence.java
index d15ca443db5b1223fc1bab924eb213cbb4feafa5..24ed9de31d091be757c41c65f177f4eb033f53d1 100755
--- a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserPersistence.java
+++ b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserPersistence.java
@@ -72,6 +72,7 @@ import ca.nrc.cadc.ac.User;
 import ca.nrc.cadc.ac.UserNotFoundException;
 import ca.nrc.cadc.ac.UserRequest;
 import ca.nrc.cadc.ac.server.UserPersistence;
+import ca.nrc.cadc.auth.HttpPrincipal;
 import ca.nrc.cadc.net.TransientException;
 import com.unboundid.ldap.sdk.DN;
 import java.security.AccessControlException;
diff --git a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/GetUserNamesAction.java b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/GetUserIDsAction.java
similarity index 100%
rename from projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/GetUserNamesAction.java
rename to projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/GetUserIDsAction.java
diff --git a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UserLogInfo.java b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UserLogInfo.java
index 79f4f1387d1a2b2ef0f2c3802b5adcf16a59c037..72ce7e855346075c685765e4f2f49e80bb767538 100644
--- a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UserLogInfo.java
+++ b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UserLogInfo.java
@@ -68,7 +68,6 @@
  */
 package ca.nrc.cadc.ac.server.web.users;
 
-
 import ca.nrc.cadc.log.ServletLogInfo;
 import javax.servlet.http.HttpServletRequest;
 
diff --git a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UsersActionFactory.java b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UsersActionFactory.java
index e78ae9803726a339b32a8c47077e10b7e38e9cad..d97c4b73584a07d302debc1f7a16df9293e95f12 100644
--- a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UsersActionFactory.java
+++ b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UsersActionFactory.java
@@ -82,6 +82,15 @@ import javax.security.auth.x500.X500Principal;
 import javax.servlet.http.HttpServletRequest;
 import org.apache.log4j.Logger;
 
+import ca.nrc.cadc.ac.server.web.AddGroupMemberAction;
+import ca.nrc.cadc.ac.server.web.AddUserMemberAction;
+import ca.nrc.cadc.ac.server.web.DeleteGroupAction;
+import ca.nrc.cadc.ac.server.web.GetGroupAction;
+import ca.nrc.cadc.ac.server.web.ModifyGroupAction;
+import ca.nrc.cadc.ac.server.web.RemoveGroupMemberAction;
+import ca.nrc.cadc.ac.server.web.RemoveUserMemberAction;
+import ca.nrc.cadc.util.StringUtil;
+
 public class UsersActionFactory
 {
     private static final Logger log = Logger.getLogger(UsersActionFactory.class);
@@ -128,7 +137,7 @@ public class UsersActionFactory
             }
 
         }
-        else if (segments.length == 1)
+        else
         {
             User user = getUser(segments[0], request.getParameter("idType"),
                                 method, path);
diff --git a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UsersServlet.java b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UsersServlet.java
index ef2345d7bba3e78e282535fb7748ca2c37cf488e..37f09e3707a2287fcd24795e7a30eee9cd5660ef 100644
--- a/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UsersServlet.java
+++ b/projects/cadcAccessControl-Server/src/ca/nrc/cadc/ac/server/web/users/UsersServlet.java
@@ -84,7 +84,7 @@ public class UsersServlet extends HttpServlet
     private static final Logger log = Logger.getLogger(UsersServlet.class);
 
     /**
-     * Create a GroupAction and run the action safely.
+     * Create a UserAction and run the action safely.
      */
     private void doAction(HttpServletRequest request, HttpServletResponse response)
         throws IOException
diff --git a/projects/cadcAccessControl-Server/test/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAOTest.java b/projects/cadcAccessControl-Server/test/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAOTest.java
index 9a11b6abb24efbfa2d6388521a7281ab609e7af2..596bee8035c2d95c3e90c39e9944bcdd1b595f4a 100644
--- a/projects/cadcAccessControl-Server/test/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAOTest.java
+++ b/projects/cadcAccessControl-Server/test/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAOTest.java
@@ -303,11 +303,62 @@ public class LdapUserDAOTest extends AbstractLdapDAOTest
                     return null;
                 }
                 catch (Exception e)
+                {
+                    throw new Exception("Problems", e);
+                } 
+            }
+        });
+    }
+    
+    /**
+     * Test of testGetCadcUserIDs.
+     */
+    @Test
+    public void testGetCadcUserIDs() throws Exception
+    {
+        Subject subject = new Subject();
+       
+        
+        // anonymous access
+        int users1 = (Integer)Subject.doAs(subject, new PrivilegedExceptionAction<Object>()
+        {
+            public Object run() throws Exception
+            {
+                try
+                {            
+                    
+                    int count = getUserDAO().getCadcIDs().size();
+                    assertTrue(count > 0);
+                    return count;
+                }
+                catch (Exception e)
                 {
                     throw new Exception("Problems", e);
                 }
             }
         });
+        
+        // authenticated access
+        subject.getPrincipals().add(testUser.getUserID());
+        int users2 = (Integer)Subject.doAs(subject, new PrivilegedExceptionAction<Object>()
+                {
+                    public Object run() throws Exception
+                    {
+                        try
+                        {            
+                            
+                            int count = getUserDAO().getCadcIDs().size();
+                            assertTrue(count > 0);
+                            return count;
+                        }
+                        catch (Exception e)
+                        {
+                            throw new Exception("Problems", e);
+                        }
+                    }
+                });
+        assertEquals("User listing should be independent of the access type",
+                users1, users2);
     }
     
     private static void check(final User<? extends Principal> user1, final User<? extends Principal> user2)
diff --git a/projects/cadcAccessControl-Server/test/src/ca/nrc/cadc/ac/server/web/users/GetUserIDsActionTest.java b/projects/cadcAccessControl-Server/test/src/ca/nrc/cadc/ac/server/web/users/GetUserIDsActionTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..386148bb6429e6727997a4d431be9e14edb3e8cc
--- /dev/null
+++ b/projects/cadcAccessControl-Server/test/src/ca/nrc/cadc/ac/server/web/users/GetUserIDsActionTest.java
@@ -0,0 +1,164 @@
+/*
+ ************************************************************************
+ *******************  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.users;
+
+import static org.junit.Assert.fail;
+
+import java.io.PrintWriter;
+import java.security.Principal;
+import java.util.ArrayList;
+import java.util.Collection;
+
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.log4j.Level;
+import org.apache.log4j.Logger;
+import org.easymock.EasyMock;
+import org.junit.BeforeClass;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import ca.nrc.cadc.ac.server.GroupPersistence;
+import ca.nrc.cadc.ac.server.UserPersistence;
+import ca.nrc.cadc.ac.server.web.GetGroupNamesAction;
+import ca.nrc.cadc.ac.server.web.GroupLogInfo;
+import ca.nrc.cadc.auth.HttpPrincipal;
+import ca.nrc.cadc.util.Log4jInit;
+import ca.nrc.cadc.uws.server.SyncOutput;
+
+/**
+ *
+ * @author adriand
+ */
+public class GetUserIDsActionTest
+{
+    private final static Logger log = Logger.getLogger(GetUserIDsActionTest.class);
+
+    @BeforeClass
+    public static void setUpClass()
+    {
+        Log4jInit.setLevel("ca.nrc.cadc.ac", Level.INFO);
+    }
+
+    @Test
+    @Ignore
+    public void testRun() throws Exception
+    {
+        try
+        {
+            Collection<HttpPrincipal> userIDs = new ArrayList<HttpPrincipal>();
+            userIDs.add(new HttpPrincipal("foo"));
+            userIDs.add(new HttpPrincipal("bar"));
+
+            final UserPersistence mockPersistence = EasyMock.createMock(UserPersistence.class);
+            EasyMock.expect(mockPersistence.getCadcIDs()).andReturn(userIDs).once();
+
+            final PrintWriter mockWriter = EasyMock.createMock(PrintWriter.class);
+            mockWriter.write("foo", 0, 3);
+            EasyMock.expectLastCall();
+            mockWriter.write(44);
+            EasyMock.expectLastCall();
+            mockWriter.write("bar", 0, 3);
+            EasyMock.expectLastCall();
+            mockWriter.write("\n");
+            EasyMock.expectLastCall();
+
+            final SyncOutput mockSyncOutput =
+                    EasyMock.createMock(SyncOutput.class);
+
+            mockSyncOutput.setHeader("Content-Type", "text/csv");
+
+            final HttpServletResponse mockResponse = EasyMock.createMock(HttpServletResponse.class);
+            mockResponse.setContentType("text/csv");
+            EasyMock.expectLastCall();
+            EasyMock.expect(mockResponse.getWriter()).andReturn(mockWriter).once();
+
+            UserLogInfo mockLog = EasyMock.createMock(UserLogInfo.class);
+
+            EasyMock.replay(mockPersistence, mockWriter, mockResponse, mockLog);
+
+            GetUserIDsAction action = new GetUserIDsAction(mockLog)
+            {
+                @Override
+                <T extends Principal> UserPersistence<T> getUserPersistence()
+                {
+                    return mockPersistence;
+                };
+            };
+
+            action.run();
+        }
+        catch (Throwable t)
+        {
+            log.error(t.getMessage(), t);
+            fail("unexpected error: " + t.getMessage());
+        }
+    }
+
+}