jcifs.smb.SmbException:

Hi all,
i use jcifs login method to login my system.For windows 2000,xp it works fine. But when some one try to login using windows 98 pc it gives following error. all the machine connect to the network and using same domain.

pls tell me the issue!

hear is the error.
=============error massage===============================
type Exception report
message 
description The server encountered an internal error () that prevented it from fulfilling this request.
exception 
jcifs.smb.SmbException: 
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at jcifs.smb.SigningDigest.<init>(SigningDigest.java:42)
at jcifs.smb.SmbSession.sessionSetup
(SmbSession.java:267)
at jcifs.smb.SmbSession.send(SmbSession.java:228)
at jcifs.smb.SmbTree.treeConnect(SmbTree.java:134)
at jcifs.smb.SmbSession.logon(SmbSession.java:159)
at jcifs.smb.SmbSession.logon(SmbSession.java
:152)
at jcifs.http.NtlmHttpFilter.doFilter(NtlmHttpFilter.java:155)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter
(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke
(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service
(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:738)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:526)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run
(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)

jcifs.smb.SigningDigest.<init>(SigningDigest.java:59)
jcifs.smb.SmbSession.sessionSetup(SmbSession.java:267)
jcifs.smb.SmbSession.send(SmbSession.java
:228)
jcifs.smb.SmbTree.treeConnect(SmbTree.java:134)
jcifs.smb.SmbSession.logon(SmbSession.java:159)
jcifs.smb.SmbSession.logon(SmbSession.java:152)
jcifs.http.NtlmHttpFilter.doFilter(NtlmHttpFilter.java:155)

======================end of error massage=========================
Hear is my web.xml file

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 
2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file> 
</welcome-file-list>

<filter>
<filter-name>NtlmHttpFilter</filter-name>
<filter-class>jcifs.http.NtlmHttpFilter</filter-class>
<init-param>
<param-name>
jcifs.smb.client.domain</param-name>
<param-value>doman_name</param-value>
</init-param>
<init-param>
<param-name>jcifs.netbios.wins</param-name>
<param-value>ip of server</param-value>
</init-param>
</filter>
<init-param>
<param-name>jcifs.util.loglevel</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>
jcifs.smb.lmCompatibility</param-name>
<param-value>3</param-value>
</init-param>
<filter-mapping>
<filter-name>NtlmHttpFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<session-config>
<session-timeout>30</session-timeout>
</session-config>


</web-app>

thanks..