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<Server port="8005" shutdown="SHUTDOWN">
   <GlobalNamingResources>
      <!-- Userdatabase is used to secure admin pages! Make sure the path is ok otherwise the admin jsps will not work -->
      <Resource name="WMUserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="XperienCentral user database" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" pathname="/vol/www/tomcat-mywebsite/deploy/admin-users.xml" />
   </GlobalNamingResources>
   <Service name="WebManager">
      <Connector port="8009" enableLookups="false" debug="1" protocol="AJP/1.3" URIEncoding="UTF-8" connectionTimeout="600000"/>
      <Engine name="WebManager" defaultHost="localhost">
         <Realm className="org.apache.catalina.realm.LockOutRealm" >
            <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="WMUserDatabase"/>
         </Realm>
         <Host name="localhost" unpackWARs="true" autoDeploy="false" deployOnStartup="false" appBase="/vol/www/tomcat-mywebsite/deploy">
            <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
            <Context path="/web" docBase="webmanager-backend-webapp-1.0-SNAPSHOT.war">
               <Valve className="org.apache.catalina.authenticator.DigestAuthenticator" cache="true" />
            </Context>
         </Host>
      </Engine>
   </Service>
</Server>

The LockOutRealm is used to block users who have tried to authenticate but failed too many times. The default value of the realm is 5 attempts - after 5 incorrect authentications the user is lockout. The lock is active for 5 minutes and does not allow any new login attempts. After 5 minutes the user is unlocked and the user may again attempt a new login.