One site in particular times out

[geekbyday]

Trying to get to one site through our Symantec Enterprise 7 firewalls. Browser shows following error:
Gateway Timeout
The firewall did not receive a timely and complete response from the upstream server it accessed in attempting to complete the request. This may be due to one or more of the following:
An incorrectly formatted response from the web server,
the web server suddenly became unavailable,
an overly congested network link between the web server and the firewall, or
extraordinarily high latency between the web server and the firewall.

The request seen by the firewall was:

http://www.wtcox.com/

In the firewall logs I get this:
Statistics: duration=180.08 id=2uy8w8 sent=357 rcvd=848 srcif=hme2 src=10.20.30.40/3234 svsrc=10.15.20.25/50180 dstif=hme0 dst=216.99.114.128/80 op=GET arg=

http://www.wtcox.com/

result="504 Gateway Timeout" proto=http rule=6 (Timed out during data transfer)

Any other sites work fine. I can get to yahoo, google etc. But just this one site gives this error. However, if I switch to my external DSL test line (outside my work network) it works fine.

Any ideas?

 

[geekbyday]

Took an ethereal trace today on my laptop using my external DSL line. This site is using http1.1 Wasn't there a problem with Symantec Enterprise 7.x not liking http1.1? Any intel would be great guys.

Thanks