serving mpg movies from apache

I have a Linux-based apache werbserver, version 1.3.23-14, and when I
access a link to short 1 minute long mpg file, it streams beautifully
with my client setup - win2k/Netscape 7.1/quicktime plugin. The URL of
this mpg is

http://www.southern.dpsnc.net/~nkandah/videos/first2.mpg

If you wanna see it. It's nothing spectacular, I am just
experimenting. A side note, Internet Explorer, the latest version,
won't even touch this mpg, doesn't open one bit....

Now, I have a second webserver (call it lightyearcomputing.com)
through which a ProxyPass directive has been established to a proxy
webserver ( call it kandah.org)on the lan, and the mpg files resides
on kandah.org. But when I access the mpg, the movie gets truncated,
and doesn't play at all properly through the above mentioned client
setup. The URL for this mpg is

http://www.kandah.org/videos/sanfran2004/first2.mpg

If you wanna try out these URLS. How they open, of course, depends on
your client setup. If, however, the mpg is served directly from
lightyearcomputing.com it streams nicely through my client setup. SO
my question is there something about the ProxyPass setup that prevents
mpgs from being served properly through the lightyearcomputing.com
server? Thanks in advance for any insights you might have and
workarounds you might suggest.

Nabeel