Q: Why does my firewall hate the cambridge picturehouse?

[Jeremy Henty]

Recently, whenever I try to access the Cambridge Arts Picturehouse at

    http://www.picturehouses.co.uk/cinema_home_date.aspx?venueId=camb

the download grinds to a  halt, the connection resets, and my firewall
log fills  up with dropped packets.   Has anyone else  seen this?  Any
clues about debugging iptables LOG output?

If you want more details...

My  iptables   INPUT  chain   accepts  everything  from   RELATED  and
ESTABLISHED  connections and  LOGs  and DROPs  everything else.   It's
really simple and it's been configured that way for years.

I see the same behaviour whether I access the URL with Firefox, Dillo,
links or wget.

The  URL used  to work  fine.  I  think the  problems coincide  with a
redesign of the site (but I could be wrong).

I also  recently moved to  a fresh Linux  From Scratch.  I  copied the
previous iptables configuration so I  doubt it has anything to do with
the problem (but again I could be wrong).

I'm not seeing these problems with any other URL or protocol.

Any ideas?

TIA, 

Jeremy Henty