diff --git a/openerp/addons/base/res/res_users.py b/openerp/addons/base/res/res_users.py
index 51be4adc747..000ea6e35fc 100644
--- a/openerp/addons/base/res/res_users.py
+++ b/openerp/addons/base/res/res_users.py
@@ -35,6 +35,7 @@ from osv import fields,osv
 from osv.orm import browse_record
 from service import security
 from tools.translate import _
+import openerp.exceptions
 
 class groups(osv.osv):
     _name = "res.groups"
@@ -437,14 +438,14 @@ class users(osv.osv):
         if passwd == tools.config['admin_passwd']:
             return True
         else:
-            raise security.ExceptionNoTb('AccessDenied')
+            raise openerp.exceptions.AccessDenied()
 
     def check(self, db, uid, passwd):
         """Verifies that the given (uid, password) pair is authorized for the database ``db`` and
            raise an exception if it is not."""
         if not passwd:
             # empty passwords disallowed for obvious security reasons
-            raise security.ExceptionNoTb('AccessDenied')
+            raise openerp.exceptions.AccessDenied()
         if self._uid_cache.get(db, {}).get(uid) == passwd:
             return
         cr = pooler.get_db(db).cursor()
@@ -453,7 +454,7 @@ class users(osv.osv):
                         (int(uid), passwd, True))
             res = cr.fetchone()[0]
             if not res:
-                raise security.ExceptionNoTb('AccessDenied')
+                raise openerp.exceptions.AccessDenied()
             if self._uid_cache.has_key(db):
                 ulist = self._uid_cache[db]
                 ulist[uid] = passwd
@@ -470,7 +471,7 @@ class users(osv.osv):
             cr.execute('SELECT id FROM res_users WHERE id=%s AND password=%s', (uid, passwd))
             res = cr.fetchone()
             if not res:
-                raise security.ExceptionNoTb('Bad username or password')
+                raise openerp.exceptions.AccessDenied()
             return res[0]
         finally:
             cr.close()
@@ -481,7 +482,7 @@ class users(osv.osv):
         password is not used to authenticate requests.
 
         :return: True
-        :raise: security.ExceptionNoTb when old password is wrong
+        :raise: openerp.exceptions.AccessDenied when old password is wrong
         :raise: except_osv when new password is not set or empty
         """
         self.check(cr.dbname, uid, old_passwd)
diff --git a/openerp/osv/osv.py b/openerp/osv/osv.py
index 02c6fbe3c5d..f2f8bb6be23 100644
--- a/openerp/osv/osv.py
+++ b/openerp/osv/osv.py
@@ -30,14 +30,10 @@ from psycopg2 import IntegrityError, errorcodes
 from openerp.tools.func import wraps
 from openerp.tools.translate import translate
 from openerp.osv.orm import MetaModel
+import openerp.exceptions
 
-
-class except_osv(Exception):
-    def __init__(self, name, value, exc_type='warning'):
-        self.name = name
-        self.exc_type = exc_type
-        self.value = value
-        self.args = (exc_type, name)
+# For backward compatibility
+except_osv = openerp.exceptions.Warning
 
 service = None
 
diff --git a/openerp/service/security.py b/openerp/service/security.py
index 86c381b683f..ff140ad261b 100644
--- a/openerp/service/security.py
+++ b/openerp/service/security.py
@@ -19,18 +19,12 @@
 #
 ##############################################################################
 
+import openerp.exceptions
 import openerp.pooler as pooler
 import openerp.tools as tools
 
 #.apidoc title: Authentication helpers
 
-class ExceptionNoTb(Exception):
-    """ When rejecting a password, hide the traceback
-    """
-    def __init__(self, msg):
-        super(ExceptionNoTb, self).__init__(msg)
-        self.traceback = ('','','')
-
 def login(db, login, password):
     pool = pooler.get_pool(db)
     user_obj = pool.get('res.users')
@@ -40,7 +34,7 @@ def check_super(passwd):
     if passwd == tools.config['admin_passwd']:
         return True
     else:
-        raise ExceptionNoTb('AccessDenied: Invalid super administrator password.')
+        raise openerp.exceptions.AccessDenied()
 
 def check(db, uid, passwd):
     pool = pooler.get_pool(db)