Authentification requise en tomcat

Bonsoir a tous,
j'ai un problème d'authentification lors de l'accée a l'administration de
tomcat, il me demandé d'entrée le nom d'utilisateur et mot de passe malgrés qu'au installation j'ai rien mis.
j'ai cherché des solution e je trouve que le fichier tomcat-user.xml est le fichier conteneur de user.
et c la suisvant tout que je trouve:
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<?xml version='1.0' encoding='cp1252'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<tomcat-users>
<!--
NOTE: The sample user and role entries below are wrapped in a comment
and thus are ignored when reading this file. Do not forget to remove
<!.. ..> that surrounds them.
-->
<!--
<role rolename="tomcat"/>
<role rolename="role1"/>
<user username="tomcat" password="tomcat" roles="tomcat"/>
<user username="both" password="tomcat" roles="tomcat,role1"/>
<user username="role1" password="tomcat" roles="role1"/>
-->

</tomcat-users>
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mais les 3 utilisateur n'ont passée le demande de l'administration

aider moi s'il vous plait !!