Hi, On some application servers I have used in the past when you shut them down and restarted the server it was possible that duplicate session ID's were generated matching those in a previously running instance of the server. Does anyone know if tomcat really has Unique Session ID creation. That is I leave tomcat running for a week. Stop it. Start it. Is it possible that a duplication session ID will be created in my new running instance that matches a session ID created in my previous running instance. I just want to know does tomcat really guarantee unique Session ID's even over shutdown and start ups?? Thanks, Steve. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx