diff --git a/rhodecode/model/forms.py b/rhodecode/model/forms.py
--- a/rhodecode/model/forms.py
+++ b/rhodecode/model/forms.py
@@ -300,6 +300,26 @@ class LdapLibValidator(formencode.valida
             raise LdapImportError
         return value
 
+class BaseDnValidator(formencode.validators.FancyValidator):
+
+    def to_python(self, value, state):
+
+        try:
+            value % {'user':'valid'}
+
+            if value.find('%(user)s') == -1:
+                raise formencode.Invalid(_("You need to specify %(user)s in "
+                                           "template for example uid=%(user)s "
+                                           ",dc=company...") ,
+                                         value, state)
+
+        except KeyError:
+            raise formencode.Invalid(_("Wrong template used, only %(user)s "
+                                       "is an valid entry") ,
+                                         value, state)
+
+        return value
+
 #===============================================================================
 # FORMS        
 #===============================================================================
@@ -457,6 +477,6 @@ def LdapSettingsForm():
         ldap_ldaps = StringBoolean(if_missing=False)
         ldap_dn_user = UnicodeString(strip=True,)
         ldap_dn_pass = UnicodeString(strip=True,)
-        ldap_base_dn = UnicodeString(strip=True,)
+        ldap_base_dn = All(BaseDnValidator, UnicodeString(strip=True,))
 
     return _LdapSettingsForm