Index: reviewboard/accounts/backends.py
===================================================================
--- reviewboard/accounts/backends.py	(revision 2097)
+++ reviewboard/accounts/backends.py	(working copy)
@@ -248,22 +248,23 @@ class ActiveDirectoryBackend:
         connections = self.get_ldap_connections()
 
         username = username.strip()
+        required_group = settings.AD_GROUP_NAME
 
         for con in connections:
             try:
                 bind_username ='%s@%s' % (username, self.get_domain_name())
                 con.simple_bind_s(bind_username, password)
                 user_data = self.search_ad(con, '(&(objectClass=user)(sAMAccountName=%s))' % username)
-                try:
-                    group_names = self.get_member_of(con, user_data)
-                except Exception, e:
-                    logging.error("Active Directory error: failed getting groups for user %s" % username)
-                    return None
-                required_group = settings.AD_GROUP_NAME
-                if required_group and not required_group in group_names:
-                    logging.warning("Active Directory: User %s is not in required group %s" % (username, required_group))
-                    return None
-
+                if required_group:
+                    try:
+                        group_names = self.get_member_of(con, user_data)
+                    except Exception, e:
+                        logging.error("Active Directory error: failed getting groups for user %s" % username)
+                        logging.error('Exception text: %s' % e)
+                        return None
+                    if not required_group in group_names:
+                        logging.warning("Active Directory: User %s is not in required group %s" % (username, required_group))
+                        return None
                 return self.get_or_create_user(username, user_data)
             except ldap.SERVER_DOWN:
                 logging.warning('Active Directory: Domain controller is down')