diff --git a/app/models/auth_source_ldap.rb b/app/models/auth_source_ldap.rb
index 5a6789a..72d44c8 100644
--- a/app/models/auth_source_ldap.rb
+++ b/app/models/auth_source_ldap.rb
@@ -30,7 +30,11 @@ class AuthSourceLdap < AuthSource
     return nil if login.blank? || password.blank?
     attrs = []
     # get user's DN
-    ldap_con = initialize_ldap_con(self.account, self.account_password)
+    if (self.account == "") && (self.account_password == nil)
+      ldap_con = initialize_anon_ldap_con()
+    else
+      ldap_con = initialize_ldap_con(self.account, self.account_password)
+    end
     login_filter = Net::LDAP::Filter.eq( self.attr_login, login ) 
     object_filter = Net::LDAP::Filter.eq( "objectClass", "*" ) 
     dn = String.new
@@ -77,6 +81,13 @@ private
     ) 
   end
   
+  def initialize_anon_ldap_con()
+    Net::LDAP.new( {:host => self.host,
+                    :port => self.port,
+                    :encryption => (self.tls ? :simple_tls : nil)}
+    )
+  end
+
   def self.get_attr(entry, attr_name)
     entry[attr_name].is_a?(Array) ? entry[attr_name].first : entry[attr_name]
   end