problems with sessions variables and virtual domains in apache

["esteban" <apps@xxxxxxxxxxxxx>]

I have a windows 2000 server with apache 2.0 and php 5.1.2. I use session
variables to validate users, each page have something like this:

if($_SESSION["validated"]==0){
  header("Location: index.php");
  exit;
 }

This worked fine when i had only one domain, but when i began to use virtual
domains, sometimes, not always, the session variable lost the value or the
session variable is distroyed, i don't know what really happens.  I add this
lines to httpd.conf for each domain and the main domain is first:

<VirtualHost *:80>
    ServerAdmin admin@xxxxxxxxxx
    DocumentRoot "C:/Program Files/Apache Group/Apache2/htdocs/domain"
    ServerName www.domain.com
    ErrorLog logs/domain.com-error_log
    CustomLog logs/domain.com-access_log common
    php_admin_value upload_tmp_dir "C:/Program Files/Apache
Group/Apache2/htdocs/domain/tmp"
    php_admin_value session.save_path "C:/Program Files/Apache
Group/Apache2/htdocs/domain/session"
</VirtualHost>

At the beginning i didn't use the two last lines with php_admin_value, i add
the lines for trying to solve the problem but it doesn't work.

I have an application made with phpmaker and SquierreMail v.1.4.7 too, and i
have the same problem in both. In both case sometimes, when i want to go to
other page, the server ask me for the username and the password, it is not
always.

Please help me

Thanks.

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