[squid-users] wrong website

Hi

We can´t to see the web site http://toxnet.nlm.nih.gov/ with
squid-2.5Stable9, without proxy
the site can be accessed without problems, but with proxy waiting some
minutes The browser is
empty and the access.log show:

1115300442.065 340873 X.X.X.X TCP_MISS/000 0 GET
http://toxnet.nlm.nih.gov/ToxNetImages/NavBar_r6_c1.gif -
DEFAULT_PARENT/parent.proxy -
1115300442.065 340876 X.X.X.X TCP_MISS/000 0 GET
http://toxnet.nlm.nih.gov/ToxNetImages/NavBar_r8_c1.gif -
DEFAULT_PARENT/parent.proxy -
1115300644.889 1617854 X.X.X.X TCP_MISS/504 7263 GET
http://toxnet.nlm.nih.gov/ToxNetImages/gatewayover.gif -
DEFAULT_PARENT/parent.proxy text/html
1115300644.889 1619850 X.X.X.X TCP_MISS/504 7263 GET
http://toxnet.nlm.nih.gov/ToxNetImages/medlineplusover.gif -
DEFAULT_PARENT/parent.proxy text/html

Any ideas?
Thanks in Advance.

-- 
Emilio C.