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Problem of Tomcat behind a firewall router

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I'm running Tomcat 4.1 on Xp which is behind a PCI firewall router and trying to make a home server. I have applied a dynamic name in "" and it works fine with my LAN computers. But when it is connected through internet, some problems occur:

1. some computers can access the website, but some of JSP files which are protected by login filter can't be shown, the browser just say the website is found and keep loading. However, sometimes when I clicked the button several times, the page can be shown!

2. some in other places can't: The browser just said the website is found and keeping loading.

I've already open the port in the firewall and used port forwarding to direct external request to the internal tomcat server.And Host name in server.xml is also changed to the applied dynamic name. Here's the detailed contents of my program:

Program Lang: Struts, JSP
OS: XP with no firewall (I've used Linux but same Problem occur)
Web Server: Tomcat 4.1
SQL Server: Postgresql 7.4
Port opened: 81
Port directed: 8080
Boardband: 1.5M adsl

Can anyone pls tell me what's wrong with it? Many many thanks!
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