Tomcat 6.0.18 JNDIRealm ConnectException: Connection timed out

[S.V.]

Hi,

i have tomcat 6.0.18 and configured it to use JNDIRealm for a specific path:


         <Realm className="org.apache.catalina.realm.JNDIRealm"

            test="89"

            connectionName="CN=tomcat,CN=
Users,DC=host,DC=de"
            connectionPassword="***"
            connectionURL="ldap://host:389/";

            referrals="follow"

            userBase="DC=host,DC=de"
            userRoleName="memberOf"
            userSearch="(&amp;(sAMAccountName={0})(objectClass=user))"
            userSubtree="true"
         />

  <login-config>
    <auth-method>BASIC</auth-method>
    <realm-name>JNDIRealm</realm-name>
  </login-config>


The problem is that sometimes it is working fine,
but sometimes Tomcat got an exception and users can not be authenticated,
because the connections to ldap (AD) timed out.

2010-10-28 15:53:08,592   ContainerBase.[Catalina]
ERROR [ttp-8443-1] - Exception performing authentication
javax.naming.PartialResultException [Root exception is
javax.naming.CommunicationException: host.de:389 [Root exception is
java.net.ConnectException: Connection timed out: connect]]


Have someone an idea or a hint to find out, why these connections are timing
out sometimes?

Thanks in advance