URGENT help...XSL page cannot be located...

hi this is my first posting so I'm a little green...but here's the scenario
that has stumped me for a week and a half.

I have an index HTML page that links to an XML page which uses an XSL page.
This all exists on  my coorporate intranet...
INTERNALLY on the network people have NO issues viewing the page.  The
problem I have been having involves a few people who
are dialing in to our network using a secure client.
They get a message saying "cannot locate the http://........XSL page".

I have been unable to figure out why internally people have no problem but
externally they do....
It may be some type of firewall issue but our MIS dep. does not believe so.

Could it be that tree versiop of IE does not support the stylesheet
namespace I am using below:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl">

What is the difference between the 2.
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl">
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">


Any help is greatly appreciated....including any workarounds others may be
aware of...I'm stumped

Thanks,
Stephen


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list