Cannot Create HttpSession Object Tomcat 4.1

Hi,
I have a Servlet application that works fine on my local machine but when I try to deploy it on a commercial web server the program 'freezes' when it gets to the point in the program where a HttpSession object is created it simply stops with no Exception thrown.....
Any help would be greatly appreciated
Thanks in advance
Kev

post your code..

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      <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" debug="0" jsr77Names="false"/>
      <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" debug="0"/>
      <GlobalNamingResources>
        <Environment name="simpleValue" override="true" type="java.lang.Integer" value="30"/>
        <Resource name="jdbc/MyDBASE" scope="Shareable" type="javax.sql.DataSource"/>
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          <parameter>
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          <parameter>
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          <parameter>
            <name>username</name>
            <value>Myadmin</value>
          </parameter>
          <parameter>
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            <value>2</value>
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      <Service className="org.apache.catalina.core.StandardService" debug="0" name="Tomcat-Standalone">
        <Engine className="org.apache.catalina.core.StandardEngine"
                   debug="0" defaultHost="localhost"
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                   name="Standalone">
          <Host className="org........
            <Context className="org.apache.catalina.core.StandardContext" cachingAllowed="true"
                      charsetMapperClass="org.apache.catalina.util.CharsetMapper"
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                      docBase="/WebModule1" mapperClass="org.apache.catalina.core.StandardContextMapper"
                      path="/WebModule1" privileged="false" reloadable="false" swallowOutput="false"
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                            description="DB connection"
                            name="jdbc/MyDBASE" scope="Shareable"
                            type="javax.sql.DataSource"/>
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    Play with defaults?: <input type=radio name=default value="yes">Yes
    <input type=radio name=default value="no">No
    </form>
    <% if (numguess.getRadio().equals("no")) { %>
    <form method=get>
    Enter upper limit:<input type=text name=upperLimit>
    Enter lower limit:<input type=text name=lowerLimit>
    </form>
    <% numguess.reset(); %>
    <% } %>
    <form method=get>
    What's your guess? <input type=text name=guess>
    <input type=submit value="Submit">
    </form>
    <% } else { %>
    Good guess, but nope. Try <b><%= numguess.getHint() %></b>.
    You have made <%= numguess.getNumGuesses() %> guesses.<p>
    I'm thinking of a number between <jsp:getProperty name="numguess" property="lowerLimit"/> and <jsp:getProperty name="numguess" property="upperLimit"/>.<p>
    <form method=get>
    What's your guess? <input type=text name=guess>
    <input type=submit value="Submit">
    </form>
    <% } %>
    </font>
    </body>
    </html>
    and the bean:
    * Originally written by Jason Hunter, http://www.servlets.com.
    package num;
    import java.util.*;
    public class NumberGuessBean {
    int answer;
    boolean success;
    String hint;
    int numGuesses;
    String radiochoice;
    int lowerLimit=0;
    int upperLimit=100;
    String error;
    public NumberGuessBean() {
    reset();
    public void setGuess(String guess) {
    numGuesses++;
    int g;
    try {
    g = Integer.parseInt(guess);
    catch (NumberFormatException e) {
    g = -1;
    if (g == answer) {
    success = true;
    else if (g == -1) {
    hint = "a number next time";
    else if (g < answer) {
    hint = "higher";
    else if (g > answer) {
    hint = "lower";
    public void setRadio(String s) {
         radiochoice=s;
    public String getRadio() {
         return radiochoice;
    public void setLowerLimit( int lowerLimit) {
         this.lowerLimit=lowerLimit;
    public int getLowerLimit() {
         return lowerLimit;
    public void setUpperLimit(int upperLimit) {
         this.upperLimit=upperLimit;
    public int getUpperLimit() {
         return upperLimit;
    public boolean getSuccess() {
    return success;
    public String getHint() {
    return "" + hint;
    public String getError() {
         return ""+error;
    public int getNumGuesses() {
    return numGuesses;
    public void reset() {
         if (getRadio().equals("yes")) {
              answer = (int)(Math.random()*100);
         else {
              int i;
              i=(int)(Math.random()*upperLimit);
              if (i<lowerLimit) {
                   i=i+lowerLimit;
              answer=i;
         success = false;
    numGuesses = 0;
    }

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